Black/White Elastic Buttonhole Stretchable Flat Elastic Woven - 15mm/20mm/25mm. 5mm Colourful Flat Elastic Cord Stretch Elastic Strap Band for Sewing Face Mask. Widths: 3mm, 4mm, 5mm, 6mm, 7mm, 9mm, 12mm, 25mm, 32mm, 38mm, 50mm, 75mm.
eBay