These are stoppers for bundling cables, etc. Made of plastic: polycarbonate, ABS resin. A pack of 5 pieces, in various sizes. Useful in various situations in daily life. Not to be dramatic, but once you use them, you won't be able to live without them. [How to Use] 1. Use the pad of your thumb to press the protruding part above the logo, and pull the lever with the uneven "jaws" away from the insertion hole. 2. Place the items you want to bundle between the jaws and the hinged screw. 3. Insert the jaws back in place and tighten them with a clicking sound, and the items you want to bundle will be secured. It's very convenient because it's easier to bundle things compared to something like "nejiricco" (twist ties). The seller attaches them to a backpack strap to hang a folding umbrella. Thank you for viewing.