Our  ID collar uses a safe and soft nylon material. The collar can be washed, just throw it in a linen bag, and straight into the washer. 
The collar fits 7.5 to 10.2 inch neck and the collar is 2/5 inches wide. The size adjustment is very convenient, and it can be adjusted according to the specific size of your dog.  The metal D ring is perfect for your ID tag or belt.