D&D DURA-PRIME RIB PRO SERPENTINE belts meet or exceed USA RMA published ratings levels. They are manufactured to perform at identical or higher levels than all major US Manufacturer’s belts of the same type. DURA-PRIME RIB PRO SERPENTINE ribbed belts are designed for high speed and high drive ratio applications. They are made of abrasion and heat resistant material, and are proven through thousands of hours of customer use to be durable and dependable. All DURA-PRIME RIB PRO SERPENTINE polybelts are manufactured using the latest in belt technology.