China One Piece SellingBrand:TanseenMaterial:Rubber,Polycarbafil insideTooth Profiles:HTD5MPitch:5mmType:ClosedWidth:15mmLength:625mm,630mm,635mm,640mm,645mm,650mm,655mmHow to Caculate the Length of the Belts1.Know the type of your pulleys(X)2.Know the tooth of your pulleys(A,B)3.Know the gap between the two Shafts(C)4.Contact us that can assist you get the size