Simply trap your wire, rotate the top cap, and you get that perfect micro coil in seconds, each and every time. High quality stainless steel material. CW-20 - Make 2 mm coils, CW-25 - Makes 2.5mm coils, CW-30 - Makes 3mm Coils . Light weight and portable, perfect for travel, and on the go. Unique styling with stylish colors, each color represent each coil size. Diameter: 22 Material: Aluminum Packet Include : 1 Set x Kuro Concepts 6 in 1 Note: Body colour will vary!!