This prosthetic was developed by taking a 3D scan of a 4 year old's left arm. The arm was then mirrored to produce a right arm. Her partial forearm was then 3D scanned to be used in creating a socket within the prosthetic arms. Her left hand proved to be un-scanable do to the limitations of our current technology so we downloaded one from https://www.myminifactory.com/object/mano-e-avambraccio-9941 Thanks Zapatenzo