3mm-75mm Wide White Black Flat Elastic Band Cord Waist Woven Sewing Face Mask. Widths: 6mm, 9mm, 12mm, and 25mm. Black/White Flat Elastic Cord Stretch Woven Waist Band Sewing Face Mask 3mm-75mm. 1mm-75mm Wide Stretch White Black Flat Round Elastic Band for Sewing Strap Waist.