The present invention relates to a piston for a cartridge to be filled with a medicament, the piston comprising:a first piston member (12) comprising a first material and forming a distal end face (22) of the piston,a second piston member (14) comprising a second material of lower compressibility compared to the first material,wherein the second piston member (14) is arranged in a cupped receptacle (16) of the first piston member (12) and provides a thrust receiving surface (25) at a proximal end (24) of the piston.
