These GPM aluminium rear spring dampers are designed for TEAM LOSI ROCK REY to reduce friction and manage driving loads more effectively. They maintain the 1.4mm spring wire diameter of the original and a midpoint damper distance of 122mm to ensure compatibility. The shock shaft diameter is increased from 3.0mm to 4.0mm to improve resistance to bending under stress. The aluminium shock cylinder provides a balance of low weight and strength, while the tightly sealed spring retainer helps avoid oil leakage. The top spring retainer is adjustable so damper hardness can be tuned to match setup requirements and driving conditions.