Silicone slap wristband features with ruler printed on the back that can help your things measured. Measures in inches as well as centimeters (12" / 30cm long). Made of made of ultra-durable silicone with a built-in inner slap steel strip. Just "snap" the bracelet across your wrist, and it wraps around your arm in place. 11 13/16'' L X 1 3/16'' W