Unique Multi-Adjustable Slipper Clutch - MSC, with on their own adjustable FRONT and/or REAR slippage via different slipper pads and clutch dishes of different diameter, guarantees better and more consistent clutch procedure to create faster acceleration and less wheel spin. For enhanced performance there are two different pads with different hardness, yellow SLS pads with greater slippage and black medium hardness with less slippage. The slippage ratio between front and back tires can be adjusted individually with respect to the style of the track, tires and sporting style. The Multi-Adjustable Slipper Clutch is included in Carpet Edition. Fits XB4'20-21, XT4'20