Accessories:Input Shaft-1pcManual number:7786Product major function & usage:Brings a higher performance of the gear transmissionThe features of general appearance of this product:1. Made by harden steel #45 for better durability.2. The design of this straight shaft is to achieve a swifter more precise hook up to the gear tranmission leading to a better over-all performance with a higher degree of raw powerOther special notes and comments:For 6S users: Use this part to replace original Traxxas part no. 7786.For 8S users: Please use this part with GPM Racing #TXM355315T / TXM355316T / TXM355317T / TXM355318T / TXM355416T / TXM355418T / TXM355515T / TXM355517T. This is the unique no-slip system upgraded by GPM to increase the power of 8S.