I-Tips are individual extensions applied strand by strand for maximum versatility and movement. They are installed without using heat or glue; each I-Tip is threaded with a strand of the guest's hair through a bead and then attached by clamping the bead to the hair.Nay's Hair Co. Itip micro-link weigh 100g per bundle, each one of our bundle comes with 100 strands. For a full head installation, we usually recommend 150-200 strands (two bundles) depending on how much volume you want. Our hair is luxury quality and is guaranteed to be 100% human virgin hair with no/minimal shedding, has not been chemically altered or treated, that can be washed, colored and styled to your desire.