Adhesive lined Shrinkies are keratin protein lined thermal shrink tubing. Using shrinkies on a clients hair is very similar to applying micro bead extensions. When heat is applied to the shrinkie using a heating tool, the keratin fuses with the extension and natural hair creating a bond. The tubing shrinks down and protects this bond. Shrinkies are a durable and long lasting hair extension method. Removal is also very simple. You simply reheat the bond, remove the stick tip extension and shrinkie and clean any remaining keratin residue. Shrinkies that are described as non-adhesive do not have a coating on the inside to hold the hair extension by themselves. Non-adhesive relies solely on the keratin tip of the hair strand. We only supply the Adhesive lined shrinkies as they stay in much more securely.