Micro ring hair extensions use a technique with tiny copper rings to combine strands of natural hair with the hair extension. Also known as micro bead or micro loop extensions, they are a really great choice when it comes to a longer-term hair extension solution. ... These are extensions that are glued into place. Our attachment technique of choice is micro-rings. It is one that we believe to be the best and safest and one that we have mastered. The micro ring technique is the smallest and most undetectable non-glue hair extension technique available, which combines strands of natural hair with the extension hair using tiny copper rings.