EASY TO SEW IN:These soft silicone buckles make masks very adjustable for an excellent fit.These are so easy to use. You can use our small crochet hook, put it through small hole first, then grab the elastic (that is already sewn on), and pull through. It only takes 5 seconds max. These help your masks be efficient and make them so they fit anyone. [ONE SIZE FIT ALL]:It Works like a champ on different size elastics. This buckle can be Suitable for all different sizes of mask straps. [Soft]:The mask Buckles are made by Soft silicone .They do not come off easy with wear at all and haven't caused irritation.These little grips are perfect for anyone with a small head to make a mask fit and stay on. and does not hurt the ear. [STAYS FIRM IN PLACE]:The Bulkle have 2 holes.The big hole mae it easy to sew in and the little hole keeps the cord/strap from sliding off.It allows you to adjust the elastic band of the mask according to your face and comfort level.