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
318-3M-05 Synchronous Timing Belt OEM Part Number 318-3M-05 Belt Type 3M Timing Belt
Technical Specifications: (Inches) (mm) Outside Circumference 12.52 318 Top Width 0.20 5 Belt Depth 0.09 2.4 Material Neoprene Tooth Profile 3M