Material:316L Stainless Steel,Never Rust,High Quality,Item Size:Width 10mm,Diameter 60mm. People with the following conditions should wear a medical id jewelry: Diabetes,epilepsy,autism,allergies,coumadin,waffarin,heart diease,pacemaker,asthma,COPD,stroke,cancer,multiple sclerosis,dialysis lung disease,ADD/ADHD,Alzheimer’s,high blood pressure, children with special needs etc. Both Front and Back can be engraved,It can engrave no more than 3 lines and 25 characters per line. Come with a Medical ID Cards,Front and back availability for medical and emergency contact information,Carry in Your Wallet. In an emergency,when you might be unable to speak for yourself,a medical ID necklace speaks for you.