Elastic for Face Mask Sewing Thin Cord Strip Various Length Sizes Black White. Widths: 3mm, 4mm, 5mm, 6mm, 7mm, 9mm, 12mm, 25mm, 32mm, 38mm, 50mm, 75mm. Round/Flat Elastic Cord 1mm-25mm Wide Black & White Elastic for Sewing Waistband.
eBay