China One Piece SellingBrand:TanseenMaterial:Rubber,Polycarbafil insideTooth Profiles:HTD5MPitch:5mmType:ClosedWidth:25mmLength:310mm,315mm,320mm,325mm,330mm,335mm,340mmHow to Caculate the Length of the Belts1.Know the kind of your pulleys(X)2.Know the tooth of your pulleys(A,B)3.Know the space between the 2 Shafts(C)4.Contact us to help you get the length