You will enjoy choice of one 18 inch micro rings keratin bonds or shrinkies treatment from the selection half head 150 minutes 34 head 210 minutes full head 270 minutes micro rings are one of the safest hair extension methods on the market a small section of your natural hair is threaded through a tiny silicone lined metal tube this cushions your hair as it is clamped in place with a special tool removal is easy too the clamp is opened and the extension just slides