The PRHI Solid Arm is a bionic arm add-on kit for your 12" vintage style GI Joe action figures. It is designed to fit original style GI Joe bodies, including vintage, reissue, and Cotswold Elite Brigade bodies. It will not fit muscle bodies. The Solid Arm is available printed in color, or in Polished White Flexible if you want to paint it yourself.
This listing is for an open left hand. You may also want an additional wrist joint to attach it to your arm: https://www.shapeways.com/product/DG3L7ZR6H/prhi-solid-arm-leg-wrist-ankle-l-r?optionId=58776839
Purchase a complete kit here: https://www.shapeways.com/product/3T6LCG8SE/prhi-solid-arm-complete-kit-right-with-open-hand