Yeah Racing is shipping the Desert Lizard Piggyback Internal Spring Scale shocks for 1/10 scale rock crawlers. These new dumpers come pre-assembled for easy upgrading your current rig. Included in the kit are springs for you to featuring a double O-Ring sealing cartridge which prolongs the lifespan of the o-rings inside the shock.
In this version of piggyback shock, the compression and rebound is further controlled by the piggyback. Everything needed to install these shocks onto the crawler is included.
Source: Yeah Racing