Big Jerk Custom Products Ltd Medical Alert Dog Cat Pet ID Tag - I'm Diabetic - Personalize Colors and Yo. Strong and durable double sided pet ID tags. This product comes with up to 4 lines of personalized text on the back with a max of 20 characters on each line (name and phone number works the best, but we can also accommodate addresses and medical information). Each pet tag also comes with a brushed nickel split ring to attach your tag to your pets collar. Please follow the instructions below to place your order CLICK CUSTOMIZE NOW to choose the color of your pet tag and font Choose Size: Large (1.25" diameter) or Small (1" diameter) - small is for small dogs/cats) Enter 4 lines of text on the back of the tag Need multiple tags? We have 100's of designs to choose from