These sewing bands are made of polyester material, durable and practical | Each elastic band is about 1.9cm/0.75" in width, 5m/5.5 yards in length; black button diameter is 18mm | Color: elastic bands has black and white two color, resin button is black | The proper width and length and simple color, easy to match clothes and satisfy the sewing need | Good elastic bands with buttonhole and come with button, convenient and helpful for adjust the length, great for wrist band, shorts, skirt, maternity wear or kids clothes making, especially for pregnant woman clothes