See: SWORKz 

SWORKz have introduced a set of high-performance carbon slipper clutch pads for the S14-3. The pads are made from high-quality carbon fibre with 2 different surfaces, one side is flat and rugged while the other side with a vented design. The carbon slipper clutch pads offer smooth power delivery and less fading to keep the same feeling all the day.