Features: 1.High production value, low noise and stable quality. 2.Each component parts easy to maintain.While out of nylon monofilament and core line, big difference between right and left zipper teeth, winding screw, the machine will stop running and send a warning by over than 100 decibel sound. 3.Large feeding device that can bear the weight of 25kg or more, also we can change design according to client's requirement. 4.Centerline feeding device can bear the weight of 5kg.And design for smooth, friction-free, make the chain elastic and steady. 5.With high quality nylon monofilament can produce flat and straight zipper, and zipper won't curl after staining.Changing few parts switch the item, low costs, and dual-feeding device to improve the stability of zipper teeth.