Yesurprise;

YESURPRISE® Silicone Micro Link Rings 5mm Lined Beads for Hair Extensions Tool Dark Brown Snap Clip for Wigs

Product information:
Material: Silicone-lined Aluminum Micro Links
Size: Diameter of 5mm outside and 3mm inside
Quantity: 1x bottle of 1000pcs

How to Use
Step 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!

What advantages for silicon rings
1) No sidling from human hair. 2) No damage to human hair. It is because there is very soft silicone lined inside, so it is very safe to human hair even it is pinched very tightly.