Long Limbs Prosthetics is an interchangeable prosthetic system for long stump amputees. The project has been commissioned by the International Committee of the Red Cross to further develop an existing prosthesis system for use in crisis areas. The system consists of four components: a foot shell made of elastic polyurethane in various colours and sizes; a keel connecting the foot to the joint; an ankle joint connecting the keel to the actual leg prosthesis; and a heavy-duty nut inside the prosthesis. The modular design enables adaptation to individual needs, by enabling replacement of worn or defective individual parts.