KIM & C Silicone Micro Rings are silicone-lined metal rings used for the micro-link (micro-bead) method of hair extension attachment — no heat, glue, or chemicals required. The silicone lining grips hair securely without sliding, while being gentler on natural hair than a bare metal ring. Sold in a jar of 1000 pieces, available in Black, Dark Brown, and Beige to match different hair colors, commonly used in a 4mm diameter.