Funny this topic should come up just yesterday I had 3 new name tags made, and got Princess Tony and Patches all new collars. They are all indoor, but lately they have been trying to run out and catch the birds in my front lawn. Princess' collar came up missing last night, then she dragged out her old one this morning, and her old collar had been missing for 4 months!!! She must have hidden it. So all my kitties have collars and tags And about the break-a-way collars, mine work well, I tested them on Tony, he squirms alot so I grabed him and pulled on his collar a little and it came apart, so its all good for me