56 1/5" Outside Length, 2 1/5" Top Width, 24 Ribs All DURA-PRIME RIB PRO SERPENTINE polybelts are manufactured using the latest in belt technology..2in PL, 24 Rib 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.