Tyvek Wristbands - USA Flag Design - Event Wristband - 500 Pieces of Wristbands per Box Width 3/4" Expressions wristbands feature fun, colorful pre-printed designs that your guests will love!.Rotate colors and designs for different days of the week to keep your admissions secure Made of DuPont Tyvek which is economical, water-resistant, and comfortable. One size fits all. Strong adhesive closure with tamper-resistant feature that shreds if tampered with. Wristbands are serial numbered.