Size: The length is 8mm (0.31in) and the width is 6mm (0.24in). The biggest hole at the base is 5mm (0.20in) and the smallest hole is 3mm (0.12in). Material: Our cord locks are made of a soft skin-safe silicone material to be lightweight and durable as well as sturdy and resilient. The fine ring texture prevents slipping while installing. Can be used for a long time! Uses: Our cord locks are multi-functional and can be used in a wide variety of projects. Use on drawstrings, round or flat elastic bands, sewing, lanyards, sportwear, clothing, decorating, crafting, beading, jewelry making, floral arrangements, DIY projects, gardening, wrapping, and more! Includes: Our product comes in a pack of 100 pieces of black or white, depending on your selection. Directions: Pass the elastic loop between the prongs of a bobby pin. Then thread the bobby pin through the holes of the cord lock. Pull the bobby pin through the cord lock to the other side, bringing the elastic loop with it. Craft County Cord Locks for Face Masks saves your ears and relieves pain with our adjustable soft silicone. The silicone material is soft, flexible, lightweight, and reusable that provides a secure and adjustable solution to hold your mask’s elastic cord in place. These drawstring stoppers easily slide over the elastic cord and hold it tightly while not hurting your ears. You can adjust the fit of your DIY Handmade mask to fit all face sizes, from baby to adult.