Three colors to choose from blue, pink and purple. Bands are waterproof one size, fits most 3-10 year old kids. The band is 6 inches in diameter made from silicone and 2 QR codes. Parents add their child’s basic information to enable them to be identified if lost. You can also add notes if your child has any allergies or medical conditions that is vital to their health. It’s a great tool for EMS to and first responders to have have in an emergency.