Samix TRX-4M Aluminum Rear Shock Plate Set. These optional rear shock plates are an excellent upgrade for your Traxxas TRX-4M rock crawler. Constructed from hard anodized, CNC machined aluminum, these shock plates offer incredible strength and rigidity over the stock components. Additionally these feature thirteen shock mounting holes giving you the ability to fine tune your TRX-4M's suspension. Upgrade your rig with added strength and adjustability while giving a custom look.