Plastic buckle hook and loop strap with silicon rubber

All Purpose Straps make it easy to bundle, secure, and cinch cargo, luggage, toolboxes, equipment, and more. These fasteners cinch and adhere to itself for a firm hold. Great for power cords, camping, and organizing a variety of indoor or outdoor items. VELCOR Brand straps are easily adjustable and reusable.

You can know the function via  https://youtu.be/ORwEQKWsVNc