You can easily slip this Dog Trader's Removable Brass Name Tag onto any collar up to 1". They are easy to change from one collar to another. The actual solid brass name tag is machine stamped. The tags can accommodate four lines. Please type in below the details of what you want stamped on the tags. If you want different information on tags, please select quantity, type in the info you want on the first tag(s), click "add to cart", click "continue shopping" and then repeat the process.