Our dog id tags are stylish, chew proof and silent.They are made from metal, plastic,acrylic and so on allow for 5 lines of text with 19 characters per line. With a choice of various designs, ranging from a simple circle to a dogs face, these large dog ID tags are approximately 1 1/2 inches / 4 cm's in size .We recommend that you put the following onto your dog tag : Your Name Your Address Your Telephone Number Happy Dogs Dog Tags come in three sizes: Small Dog Tags: 1 inch / 2 cms Medium Dog Tags: 1 1/4 inches / 3 cms Large: Dog Tags: 1 1/2 inches / 4 cms