... will make the hair more tighten. 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#, ... # Packing: 100pcs/bottle, 1440bottles/ctn Micro ring with silicon 100PCS packing