Softer shockblocks than the standard ones that comes with your matrix II truck
MBS “ShockBlocks” combine the rebound of steel coil springs and the shock absorption of urethane into a single piece. Turning resistance can be fine-tuned via the Matrix II Truck adjustment screw. Yellow ShockBlocks (Soft) allow for very tight turns. Red Shockblocks (Hard) are best for stability at high speeds. Orange Shockblocks (Medium) cover the middle ground. Compatible with Matrix II and Matrix II Pro trucks.