For larger cats! I have cats that weigh 5.7 kg and 6.3 kg! Reviews mentioned that it's designed to come off if it gets caught on something while they're running around. I've opened the bag, but I haven't actually tried it on the cats. It wasn't what I was expecting, so I'm selling it. Please refrain from purchasing if you are concerned since the bag has been opened. The bell sound is not quiet, but it's not too loud either. Separate purchases are also possible!