diff --git a/bindings/Sofa/src/SofaPython3/Sofa/Core/Binding_Mass.cpp b/bindings/Sofa/src/SofaPython3/Sofa/Core/Binding_Mass.cpp
index 75af4211..b6ae245c 100644
--- a/bindings/Sofa/src/SofaPython3/Sofa/Core/Binding_Mass.cpp
+++ b/bindings/Sofa/src/SofaPython3/Sofa/Core/Binding_Mass.cpp
@@ -31,24 +31,126 @@
 #include <sofa/linearalgebra/CompressedRowSparseMatrix.h>
 
 #include <pybind11/eigen.h>
+#include <SofaPython3/PythonEnvironment.h>
+using sofapython3::PythonEnvironment;
 
 /// Makes an alias for the pybind11 namespace to increase readability.
 namespace py { using namespace pybind11; }
+/// To bring in the `_a` literal
+using namespace pybind11::literals;
 
 namespace sofapython3
 {
 
 using sofa::core::behavior::Mass;
 
+template<class TDOFType>
+Mass_Trampoline<TDOFType>::Mass_Trampoline() = default;
+
+template<class TDOFType>
+Mass_Trampoline<TDOFType>::~Mass_Trampoline() = default;
+
+
+template<class TDOFType>
+void Mass_Trampoline<TDOFType>::init()
+{
+    Mass<TDOFType>::init();
+
+    PythonEnvironment::gil acquire;
+
+    if (!mstate.get())
+        mstate.set(dynamic_cast< sofa::core::behavior::MechanicalState<DataTypes>* >(getContext()->getMechanicalState()));
+
+    if(!mstate.get())
+        throw py::type_error("Missing mechanical state.");
+
+    PYBIND11_OVERLOAD(void, Mass<TDOFType>, init,);
+}
+
+
+template<class TDOFType>
+std::string Mass_Trampoline<TDOFType>::getClassName() const
+{
+    PythonEnvironment::gil acquire {"getClassName"};
+
+    // Get the actual class name from python.
+    return py::str(py::cast(this).get_type().attr("__name__"));
+}
+
+
+template<class TDOFType>
+bool Mass_Trampoline<TDOFType>::isDiagonal() const
+{
+    PythonEnvironment::gil acquire;
+
+    PYBIND11_OVERLOAD_PURE(bool, Mass<TDOFType>, isDiagonal);
+}
+
+
+template<class TDOFType>
+void Mass_Trampoline<TDOFType>::addGravitationalForce( const sofa::core::MechanicalParams* mparams, DataVecDeriv& f, const DataVecCoord& x, const DataVecDeriv& v, const Deriv& gravity)
+{
+    PythonEnvironment::gil acquire;
+
+    // pass bFactor, kFactor, energy
+    py::dict mp = py::dict("time"_a=getContext()->getTime(),
+                           "mFactor"_a=mparams->mFactor(),
+                           "bFactor"_a=mparams->bFactor(),
+                           "kFactor"_a=mparams->kFactor(),
+                           "isImplicit"_a=mparams->implicit());
+    PYBIND11_OVERLOAD_PURE(void, Mass<TDOFType>, addGravitationalForce, mp, PythonFactory::toPython(&f), PythonFactory::toPython(&x), PythonFactory::toPython(&v), gravity);
+}
+
+
+template<class TDOFType>
+SReal Mass_Trampoline<TDOFType>::getGravitationalPotentialEnergy( const sofa::core::MechanicalParams* mparams, const DataVecCoord& x, const Deriv& gravity) const
+{
+    PythonEnvironment::gil acquire;
+
+    // pass bFactor, kFactor, energy
+    py::dict mp = py::dict("time"_a=getContext()->getTime(),
+                           "mFactor"_a=mparams->mFactor(),
+                           "bFactor"_a=mparams->bFactor(),
+                           "kFactor"_a=mparams->kFactor(),
+                           "isImplicit"_a=mparams->implicit(),
+                           "energy"_a=mparams->energy());
+    PYBIND11_OVERLOAD_PURE(SReal, Mass<TDOFType>, getGravitationalPotentialEnergy, mp, PythonFactory::toPython(&x), gravity);
+}
+
+
 template<class TDOFType>
 void declare_mass(py::module &m) {
     const std::string pyclass_name = std::string("Mass") + TDOFType::Name();
-    py::class_<Mass<TDOFType>, sofa::core::behavior::ForceField<TDOFType>, py_shared_ptr<Mass<TDOFType>>> f(m, pyclass_name.c_str(), py::multiple_inheritance(), sofapython3::doc::mass::massClass);
+    py::class_<Mass<TDOFType>, sofa::core::objectmodel::BaseObject, Mass_Trampoline<TDOFType>, py_shared_ptr<Mass<TDOFType>>> f(m, pyclass_name.c_str(), py::dynamic_attr(), py::multiple_inheritance(), sofapython3::doc::mass::massClass);
 
     using Real = typename TDOFType::Real;
     using EigenSparseMatrix = Eigen::SparseMatrix<typename TDOFType::Real, Eigen::RowMajor>;
     using EigenMatrixMap = Eigen::Map<EigenSparseMatrix>;
 
+    f.def(py::init([](py::args &args, py::kwargs &kwargs) {
+        auto mass = sofa::core::sptr<Mass_Trampoline<TDOFType>> (new Mass_Trampoline<TDOFType>());
+
+        mass->f_listening.setValue(true);
+
+        if (args.size() == 1) mass->setName(py::cast<std::string>(args[0]));
+
+        py::object cc = py::cast(mass);
+        for (auto kv : kwargs) {
+            std::string key = py::cast<std::string>(kv.first);
+            py::object value = py::reinterpret_borrow<py::object>(kv.second);
+            if (key == "name") {
+                if (args.size() != 0) {
+                    throw py::type_error("The name is set twice as a "
+                                        "named argument='" + py::cast<std::string>(value) + "' and as a"
+                                                                                            "positional argument='" +
+                                        py::cast<std::string>(args[0]) + "'.");
+                }
+            }
+            BindingBase::SetAttr(cc, key, value);
+        }
+        return mass;
+    }));
+
     f.def("assembleMMatrix", [](Mass<TDOFType>& self) -> EigenSparseMatrix
     {
         sofa::linearalgebra::CompressedRowSparseMatrix<Real> matrix;
diff --git a/bindings/Sofa/src/SofaPython3/Sofa/Core/Binding_Mass.h b/bindings/Sofa/src/SofaPython3/Sofa/Core/Binding_Mass.h
index 826b78da..71a0fedb 100644
--- a/bindings/Sofa/src/SofaPython3/Sofa/Core/Binding_Mass.h
+++ b/bindings/Sofa/src/SofaPython3/Sofa/Core/Binding_Mass.h
@@ -20,10 +20,37 @@
 
 #pragma once
 
-#include <pybind11/pybind11.h>
+#include <sofa/core/behavior/BaseMass.h>
+#include <sofa/core/behavior/Mass.h>
+#include <sofa/defaulttype/VecTypes.h>
+#include <sofa/core/MechanicalParams.h>
 
 namespace sofapython3 {
 
+template<class TDOFType>
+class Mass_Trampoline : public sofa::core::behavior::Mass<TDOFType> {
+public:
+    SOFA_CLASS(Mass_Trampoline, SOFA_TEMPLATE(sofa::core::behavior::Mass, TDOFType));
+    using sofa::core::behavior::Mass<TDOFType>::mstate;
+    using sofa::core::behavior::Mass<TDOFType>::getContext;
+    using typename sofa::core::behavior::Mass<TDOFType>::DataTypes;
+    using typename sofa::core::behavior::Mass<TDOFType>::Coord;
+    using typename sofa::core::behavior::Mass<TDOFType>::Deriv;
+    using typename sofa::core::behavior::Mass<TDOFType>::DataVecDeriv;
+    using typename sofa::core::behavior::Mass<TDOFType>::DataVecCoord;
+
+    Mass_Trampoline();
+    ~Mass_Trampoline() override;
+
+    void init() override;
+    std::string getClassName() const override;
+
+    bool isDiagonal() const override;
+
+    void addGravitationalForce( const sofa::core::MechanicalParams* mparams, DataVecDeriv& f, const DataVecCoord& x, const DataVecDeriv& v, const Deriv& gravity) override;
+    SReal getGravitationalPotentialEnergy( const sofa::core::MechanicalParams* mparams, const DataVecCoord& x, const Deriv& gravity) const override;
+};
+
 void moduleAddMass(pybind11::module &m);
 
 } /// namespace sofapython3