There are Keratin Tip Extensions offered by us that have a piece of keratin on the top that gets melted down into the hair using the Philocaly melting tool, creating the bond that seals to the hair. These small bonds are attached strand by strand. The extensions are tiny strands of actual, unprocessed (or virgin) human hair. Instead of being fastened with tape or glue, keratin extensions have tiny beads of keratin adhesive at the tip of every strand. Keratin Tip Extensions are very useful.