This elastic has an improved quality over other brands that can be visually seen and experienced Your basic, traditional elastic lightweight thinner than woven. Slightly ribbed. Narrows when stretched. Insert into casings or stitch directly to fabric for waistbands, leg openings, sleeve edges necklines. Size: 12" 12.7mm. 45 yard bulk roll. 1 roll per box. Purchase by the box. First Available June 2010.