The Unbreakable Cup Holder by Diestco is made out of a durable, 600 by 300 polyester material. The cup holder attaches to your wheelchair, rollator or other mobility device with an easy-to-use webbed strap. The Unbreakable Cup Holder’s opening has a 4 inch circumference, which can easily tighten around your drink with a cord lock (allowing it to hold containers that have a 1 inch circumference to even a sports drink bottle). The cup holder has reflective tape around the bottom which can reflect up to 300 yards away.