YKK’s Racquet Coil® Standard has been specifically designed for luggage and tent applications, where resistance to abrasion and performance is a must. The Racquet Coil® chain is made of spiral plastic elements which feature a unique oval shape. This design strategically places the sewing thread, which attaches to the zipper tape, in an indentation on the oval, thus protecting it from being torn and exposed. The sliders are engineered to ensure the perfect reciprocation of the zip. Racquet Coil® is available with a Polyester tape.