Both copper and aluminium rings are fitted with silicone in the inner part which ensures that the hair inside does not get damaged and provides a better grip on the hair. Micro Ring / Micro Loop / Micro Bead Hair Extensions for individual attachment of hair extensions without the use of glue. The micro bead technique is the smallest and most undetectable hair extension technique available, which combines strands of natural hair with the extension hair. That is very important because nobody wants extensions that fall out. These micro beads stay in place and there is no way they will get loose. The silicone enables great results even for oily and hard to grip hair.