Nano’s are the smallest ring yet. I use the acrylic tipped ones which are more flexible and are more comfortable as opposed to the old style metal tips which can be harsh on the hair. No heat or glue is used and the nano is attached to sections of your own hair and the ring is threaded on and then clamped shut. These can be worn for a maximum of 12 weeks and again can be re fitted.
Prices vary depending on length, shade and thickness