How to Use tep 1 ：Simply thread the micro ring onto the threading hook.Step 2：Take a strand of your own hair and slide the micro ring onto your own hair strand by hooking it into the threading hook. Then slide the micro ring onto your own hair.Step 3：Take the extension and slide the I-Tip bond into the ring from the bottom.Step 4 :Clamp the ring shut with the closing / opening tool!Step 5 :Do several rows on back of head and the sides of head.Step 6 Cut and style extensions.Finished!The extensions will last several months, depending on how fast your own hair grows. Eventually, the micro rings will have to be removed, or moved up towards the scalp again. Size: Outer diameter:3.40mmInner diameter :3.00mmLength/Height:6.00mm The lock design can protect your hair out of any hurt and can hold your own hair more tightly.prevent the stick hair extensions falling off from your head. Premium quality copper hair tubes, perfect locks for hair extension. No sliding from hairLight weight, Protect Hair. Small rounds hair beads which prevents harmful to skin and hairDurable Euro Lock:thanks to premium quality of the material they are durable to use for everydayThese Micro-Links are small, round beads made of lightweight Copper.