Atomik RC Traxxas Slash 4X4 1:10 Aluminum Alloy Front Caster Block Hop Up Upgrade, Grey/Gun Metal Replaces Traxxas Part 6832 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 6832. Atomik RC Offers a Full Line of Hop Ups for your Traxxas Slash 4X4 1:10 Available in Red, Blue, Grey/Gunmetal.