... can supply you the best quality micro ring Micro Rings,Micro Links, Extension tube Size: 3. 00mm, 3. 50mm, 4. 00mm, ... .4X7.0mm,4.0X2.7X6.0mmMaterial: copper micro ring, Aluminum micro ring with screw and without screw, silicone micro ringColor: Black, dark/med /light brown, Auturn ...