Atomik RC Traxxas Stampede 4x4 1:10 Aluminum Alloy 12mm Wheel Hex Hop Up Upgrade, Grey/Gun Metal Replaces Traxxas Part 1654 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 1654. Atomik RC Offers a Full Line of Hop Ups for your Traxxas Stampede 4x4 1:10 Available in Red, Blue, Grey/Gunmetal.