<ul> <li><b>Elastic Cord:</b>Made of high quality Spandex which is a synthetic fabric that is prized for itselasticity. No pressure on the ears when used as a for mask elastic cord. Wearit in the most comfortable state.</li> <li><b>ElasticAdjuster: </b>Toovren buckle can effectively keep mask in place, easy meet youdifferent tightness need. Also the buckles can be recycled, used for many funcrafting activities, such as adjusting the strap length, bracelet clasp, petbuttons, toys, gifts and so on.</li> <li><b>Elastic String:</b>Used for face cover, earmuff, earflap, hair bands, sportswear, crafts DIYprojects and more. Ideal for sewing, handicrafts and handmade.</li> </ul>