Atomik RC Traxxas Nitro Sport 1:10 Aluminum Alloy Rear Stub Axle Carrier Hop Up Upgrade, Red Replaces Traxxas Part 1952 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 1952. Atomik RC Offers a Full Line of Hop Ups for your Traxxas Nitro Sport 1:10 Available in Red, Blue, Grey/Gunmetal.