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:10cmx5mm Material:Cotton colour:Black + white Package Contents: 100 * Sewing Elastic Only the above package content, other products are not included. Note: Light shooting 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.