ITips are single strands of hair installed strand by strand. There is an I shaped tip enabling them to be placed on the natural hair with keratin glue or beads. We use keratin glue which is the healthiest glue to use on the hair. Keratin is a natural protein in hair. A full application usually takes 1-3 hours. The hair extensions can last for months, but the cuticle tips need to be removed and moved up due to natural hair growth. Each of the sets at Melange Hair Extensions comes in a 50 gram package. We also offer Tape-Ins and Silicone Bead extension methods.