Atomik RC Traxxas Rustler 1:10 Aluminum Alloy Front Steering Block Hop Up Upgrade, Red Replaces Traxxas Part 3736 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 3736. Atomik RC Offers a Full Line of Hop Ups for your Traxxas Rustler 1:10 Available in Red, Blue, Grey/Gunmetal.