... make the hair more tighten. Most customer choose Micro Ring with Silicon. And it will make the hair more tighten. Micro ... piece * Material: Aluminium or copper * Type: flat ring and ring with screw * Color: 1#,3#,5#,6#,7#,8#,9#,10#,11 ... #,13#,14#,15# Packing: 100pcs/bottle, 1440bottles/ctn Micro ring with silicon 100PCS packing