Animal ID tag is made of stainless steel coated with heavy-duty polymer and with high Separation UV Printing for clear legible text. The cover protects your information and makes it long last. Rubber silencer protects the edge and makes the pet tag soundless. Our sizes consider dogs and cats of all sizes, so you can choose the best one to fit. ID tag can be scanned with any smartphone, QR code works only after activation of the QR pet ID tag in a pet`s profile in our application. Features - Comes in 2 shapes: Round & Bone - 3 sizes : Round( S: 25mm, L: 33 mm) & Bone ( 40 mm) - Base material: Stainless steel - High Separation UV Printing - Coating: Heavy-duty polymer - Silencer protects the tag's edges Personalization Customize the tag by adding the nickname of your pet and your phone number. There is a unique QR code on the back of the tag. The code is registered in the animal-id.net system. !!!Important!!! QR code works only after QR pet ID tag activation in a pet's profile!