Size 3.5" Molded very similar to the packy style that you purchase from USA. It can be used in undies as well as a harness. It is freely molded so it is free moving. The material that the prosthesis is made from is a durable and long lasting compound called Elostermeric gel. This compound is used for robotics and other prosthetic devices because it is very realistic in feel and can be pigmented to colour from its raw state. Elastomeric gel is non toxic to the skin available in many colour's.