which have good resilience allow them to restore the original length without deformation.Effectively reduce the pain and pressure of wearing a mask in the ear for a long time. Wear it in the most comfortable state.Easily slide over the earlcord with a soft adjustable buckel which holds the mask securely to the wearer.Elastic buckle band used for earmuff, earflap, and respirator mouth-muffle mask.Widely for DIY masks making, craft project supplies.Flat elastic cord is more durable and practical.It's good helper for your sewing and knitting.size:10cmx5mmMaterial:Cottoncolour:Black + whitePackage Contents:1000 x Sewing ElasticOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.