High quality POM plastic, durable and lightweight. Can be used on everything from shoelaces, pack drawstrings, pants closures, products and a variety of outdoor and gym accessories. Widely used for lanyard, luggage, clothing, backpack, shoe bags, sportswear, shoelace, hats, tent and more. Size: 23.42 x 18.19 x 12.63mm / 0.92" x 0.71" x 0.50" (L*W*H); Hole Diameter: 6.81 x 8.63mm / 0.27" x 0.34" Package Include: 100 Pcs Cord Locks (Black). The dark color will match with all your clothing with ease. 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. The fastener slider with spring loaded design, can keep a firm grip on whatever the use is for, easy to install and use. They are perfect for shock cord, elastic cord, finer cords, pull cords, draw cords, wet cords, backpacks, tends, jacket, sweater, reusable mesh bags making and other uses.