Tyvek® wristbands are made from DuPont Tyvek®, the best in the world. Duplicate number wristbands are two bands with the exact same serial number, making them perfect for identification. Packs contain 500 wristbands with 250 different sets of numbers. Short term use: approximately 1-2 days. Sequentially numbered for accountability. Waterproof, adjustable adhesive closure. 100% code two, recyclable material. Separate colors may contain different number series. Secure, tamper resistant, die cut adhesive tab. Strong, durable, and comfortable. Upholds writing with permanent and sharpie markers. Custom imprinting available.