This vintage LEGO Bionicle part, number 44139, is a gray back lift arm that fits with the Rahkshi character. It is made of durable plastic material and is a great addition to any collection of Bionicle parts. This particular piece is from the TECHNIC subtheme and is perfect for LEGO enthusiasts who are looking to complete their sets.

The arm is in excellent condition and has been carefully inspected to ensure that it is free from any defects or damage. It is a unique and rare find that is sure to impress any LEGO collector. This Bionicle part is perfect for building and creating custom Bionicle characters and is a must-have for any serious LEGO fan.