Light & Durable Material- Adjustment cord locks are made of silicone, non-toxic, tasteless, non-irritating, light and elegant, strong and practical. Easy To Use- Silicone cord buckles for Drawstrings, Simply tighten and the adjustment buckle can move freely up and down, when released, the tension is activated and the adjustment buckle remains in place. 100PCS Spring Cord Locks- You will receive 200 silicone toggles, rich quantity for your daily use. Suitable for Adults & Kids- Can be used by adults and children, non slip stopper elastic cord locks are suitable for the lanyard to adjust the length of the lanyard to match different face sizes, elastic cord drawstrings buckles will not be easy to fall off, you could wear them for a long time The strap buckle adjustable wired ear plug. Widely Used- Thin elastic band adjustment buckle, ear rope buckle, drawstring buckle, mask elastic closure, hat rope closure.