A special layer. They are produced in A,B,C,D,profiles amd 3V,5V and 8V that allow equalized wear out in the system and reduction of vibration .A(60 to237iches) ;B(60 to315 inches); C(76 to420 inches); D(90 to600 inches) ; 3V(60 to 140 inches); 5V(67 to 355 inches) 8V(100 to 500 inches). Lengths that are not in our inventory can be made to order. The product can control its interval of belts to prevent their overturn special canvas can make the surface of belt elastic andincrease its antifatigue strength the use of joint belt can over come the troubles of shock, overturn and drop, at the same time, it reduces production cost, The joint V-belt is suitable for error change of belt slot form and size. It has functions of traversing stiffness and steadiness, equal forrcedistribution and strong load-bearing capacity and powerful transmission