Materials:Cooper Micro ring,Aluminum Micro ring with screw or without screw,Silicone Micro ring 1Productshuman hair micro ring2stylesilky stratght, yaki,body wave, deep wave,water wave,jerry,kinky straight,deep curl,25curl,nature straight---according to the buyer’s requirement.3color1# 1B# 2# 4# 6# 8# 10# 12# 14# 16# 18# 22# 24# 27# 27S# 30# 33# 60#613#v130# 144# 135# 350# 530# 99J# BURG, YELLOW, ...