QUALITY: Made of plastic, odorless, safe and environmentally friendly, light in weight, not easy to break, strong and durable. 50 cord locks, 21 different colors to meet your different needs,(Random Color). TIGHTING FORCE: Built-in double-hole circular spring toggle block, the length of the wire buckle can be adjusted to keep it tight, prevent it from falling off. DOUBLE HOLE CORD LOCK: The aperture of the cord fastener is 1/4 inch (5mm), and the wire buckle is 24x21mm, suitable for most types of drawstrings and ropes. EASY TI USE: The cord lock can move up and down freely, and can be tightened by gently pressing the toggle block. When released, the cord lock will return to its original position. USES: Spring buckles can be used for elastic cables, shock-absorbing ropes, elastic cords, thin cables, shoelaces, backpacks, sportswear, etc. Suitable for outdoor activities such as camping or hiking.