all kinds of the belts Polyurethane timing belts specifications:1) XL,L,H,DH,XH2) 2M,3M,5M, ... Max.degree within short time can bear +110- Anti-oil and anti-ester- Anti acid,alkaline cautery resistanceSeamless Polyurethane Timing Belt ... low-load synchronous hierarchical transmission, such as office automation systems and home appliances..