PK belts, also known as automotive multi-ribbed belts, are a new type of synthetic material made of neoprene rubber (CR) or ethylene propylene diene monomer (EPDM) rubber combined with cord, possessing heat resistance, oil resistance, and wear resistance. Transtop belts, through optimized structural design, increase transmission power by 30% compared to ordinary PK belts within the same space, while reducing the space occupied by the transmission device by 25%. They also feature low vibration, low heat generation, and smooth operation.