Upgrade your LOSI HAMMER REY U4 ROCK RACER with these precision-engineered aluminum rear adjustable spring dampers from GPM. They are built to reduce internal friction and better absorb impact forces, helping the chassis hold a steadier balance during aggressive runs. The dampers keep the same 1.8mm spring wire diameter and use an upgraded shock shaft enlarged from 3.0mm to 4.0mm to improve durability and reduce the chance of bending under load.
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