Jewelry Clasps and Closures: package includes 30 sets barrel black break away safety clasps with 1 roll round nylon lanyard string, about 10m; can meet your different needs in daily life. Easy to Use: these DIY breakaway lanyard clasps are easy to use, you only need to insert the rope less than 2.5mm to be connected into the button and then close the button, easy to close and open, without complex steps when in use. Barrel Shape Clasps: the plastic jewelry clasps are about 24mm(0.94") in length, 9mm(0.35) in width, hole 2.5mm; perfect hole size for less 2.5mm cords. The nylon lanyard cord is 2mm in diameter, 10.9 yards(10m) in length. Plastic Material: the breakaway connectors are made of plastic, simple, cute, lightweight and durable, small parts; classic black and white, they are suitable for most types of clothes. Wide Usage: the bracelet string and clasps are perfect for lock design that connects necklace, bracelet, bubble gum necklaces, lanyards, keychains, waist chain, ankelt, strap lanyard and other accessories; can be used for bags, clothing, shoes, bags, lanyards, keychains, etc.