Micro links Hair extensions are individual strand by strand hair extensions that are attached onto the hair using a matching in color metal bead. This metal bead is usually lined with a plastic layer of silicone, that protects your hair from the possibility of breakage from the metal bead. The silicone also acts as a rubber grip to help keep the bead and hair extension in place, and minimize slippage. The hair used for this method is "I tip" hair. When installing, the I tip hair and a small bunch of natural hair is placed inside the metal bead and then closed shut using a special hair extensions tool. This method is the safest and most popular method for hair extensions.