MXL,XL,L,H,XH,T5,T10,T20,3M,5M,8M,14M,etc It has various advantages of wear resistance, shock suppression and small noise, It is many applicable to driving household electric sewing machine ,highspeed table drill,washer as well as various precision instrument. we are able to produce according to user's requirements for diffenerent circumference and model. timing belt