Security wristbands, made with DuPont Tyvek, are an economical solution to visitor and crowd control. The single-use, waterproof wristbands are great for parties, events or field trips. Bands are sequentially numbered; choice of starting number not available. To use, peel off adhesive liner, wrap around wrist and adhere to the other side of wristband. 100 per package, each measures 3/4 x 10". Green.