Most customer choose Micro Ring with Silicon. And it will make the hair more tighten. Micro Ring with silicon * Professional hair ring for hair piece * Material: Aluminium or copper * Type: flat ring and ring with screw * Color: 1#,3#,5#,6#,7#,8#,9#,10#,11#,12#,13#,14#,15# Packing: 500pcs/bottle, 200bottles/ctnProducts Show Micro ring with silicon