Use protector disks to help you with installing Keratin Bond(u-Tip) Hair Extensions to keep surrounding hair clean and protected. Simply clip the disk to hair, right at the part line where the extensions are going to be installed. Pull a strand of hair through that matches the size and weight of the extension weft. When the bond is finished, slide the hair out through the slit. Protector Disks make Keratin Bonds easier to install and they're reusable and come in a pack of 5pcs.