Atomik RC Traxxas E-Revo 1:10 Aluminum Alloy Front Shock Mount Hop Up Upgrade, Blue Replaces Traxxas Part 5317 Precision CNC Machined for Factory Spec Fitment. Hardened Billet 6061 Aluminum for Lightweight and Durable Performance. Easy Upgrade from the Original Part. Replaces Traxxas Part 5317. Atomik RC Offers a Full Line of Hop Ups for your Traxxas E-Revo 1:10 Available in Red, Blue, Grey/Gunmetal.