Durapower®II v-belts combine the advantages of EPDM, raw edge technology, and an exclusive CNA construction for superior performance and efficiency. Ethylene Propylene Diene Monomer (EPDM) is a synthetic rubber that is durable, static conductive and resistant to heat, hardening and glazing. The raw edge sidewalls reduce vibration for extended component life and assure efficient, smooth and long lasting performance. The centralized neutral axis (CNA) refers to the placement of cords in the middle of the belt cross section. This unique construction provides greater flexibility and stability.