Tyvek wristband that is tough, waterproof, and tear resistant wristbands made of Tyvek. Non stretch, single use, non transferable and tamper evident. All bands are pre-numbered. You can mix colours when ordering BUT they must be in lots of 100. Just order 500 of 1 colour but then email us to say you want to mix colours. If you want to order in lots of 500 see Tyvek EziBands Unprinted - LOTS of 500 which are more economical.