Our high grade silicone "I Have Allergies" Wristband safeguards and protects in a fun and modern way. You can write in your allergies on the back with a ball-point pen, along with urgent care contact and medical information. The next step is to boil the wristband for one minute to make the ink become indelible. This wristband was designed to help safeguard kids, tweens, teen and even adults with allergies. Measures 8 inches long. Medium snap size: 6 3/4" Large snap size: 7 1/4"