The endlessly useful better band is made from stretchy, durable tpu material and features a knot bone cord lock for quick size adjustments. With its thin, flat shape and grippe, waterproof material that is easy to clean and endlessly reusable, the better band can do everything a rubber band does, but better! the better band comes in a variety of sizes that can be customized even further by sliding the knot bone cord lock into position. Unlike spring-activated cord locks, the knot bone has no moving parts that can slip, jam, or rust. Its simple design allows you to secure the better band at the exact length and tension you need, and keeps it absolutely locked in place until you release it. It's not just the better band, it's the best. The 19" size is perfect for bundling, attaching, or wrapping items like hoses and tarps, for holding up trash bags in indoor trash cans, and much more.