By lowering the hinge pin location compared to the stock rear hubs (TKR5545)

Allows users to set a maximum motor RPM

As an official Kyosho part

#755 O Scale 2 Rail A

This is the Roll Tower Top for the Arrma Kraton 4WD BLX

ARRMA ARA-2876 High Torque Slipper Set 61T X-Monster Chassis Parts By lowering the hinge pinThis ARRMA high torque slipper set arrives pre built and factory set, ready to bolt straight into your vehicle. The slipper clutch is the transmission's shock absorber it protects the drivetrain from the sudden torque spikes of brushless power and this set is built specifically to handle those loads on ARRMA's 1 10 2WD platforms. The metal slipper hub is the key durability upgrade over worn or glazed stock components in brushless applications,