This elastic has an improved quality over other brands that can be visually seen and experienced! Made from 100% polyurethane. Thin soft & lightweight. Will stretch 3 to 4 times its original length. Chlorine safe dry cleanable. Use for stitched on or topstich applications in swimwear aerobic wear & lightweight fabrics. Can also be used to stabilize seams in knit/knit wear garments. Size 3/8in (9.5mm). 5 yard package. 4 packages per box. Purchase by the box. .