This item is a pack of 50pcs spring buttons. Simply squeeze together and the cord lock can move freely up and down. When released, tension is engaged and the cord lock stays in place. These are great for use on sweat pants or hoodies to keep from losing the drawstring and to tighten the cord as well.Can also be used to replace lost or missing barrel locks. The colorful cord lock can be used to shoelaces, pack drawstrings, pants closures, and a variety of outdoor and gym accessories. Widely used for lanyard, luggage, clothing, shoe bags. Features - Color: Random. - Material: Nylon. - Size: 1.7 * 1.7 * 1.6cm. - Simply squeeze together and the cord lock can move freely up and down. When released, tension is engaged and the cord lock stays in place. - These are great for use on sweat pants or hoodies to keep from losing the drawstring and to tighten the cord as well. - Can also be used to replace lost or missing barrel locks. - The colorful cord lock can be used to shoelaces, pack drawstrings, pants closures, and a variety of outdoor and gym accessories. Widely used for lanyard, luggage, clothing, shoe bags.