Wheels using nylon material, on the basis of wear and avoid the yarn cut the yarn off. With it, changing the gauze immediately becomes a pleasure. Nylon handle, reasonable design, feel good and easy to use. Convenienc for you to replace the yarnshaft gauze. When you use it, the wheel is aligned with the tape slightly, slowly rolling, you can easily press the tape into the card slot. Specification: Color: red white Size: 20 cm long, concave wheel outer diameter 3.4 cm Material: nylon Package includes: 2pcs*Screen Door Tool Notice: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures.