The belts exceed USA RMA published ratings levels; They are designed to perform at the identical or higher level than all other major USA Manufacturer's belts of the same type
288-3M-12 Synchronous Timing Belt OEM Part Number 288-3M-12 Belt Type 3M Timing Belt
Technical Specifications: (Inches) (mm) Outside Circumference 11.34 288 Top Width 0.47 12 Belt Depth 0.09 2.4 Material Neoprene Tooth Profile 3M