I have been trying to find the perfect ferret collar for about 4 years now and have finally figured it out. I make my own collars now out of leather shoelace, a split-ring for the bell, and a bell from Petsmart. The collars are wonderful and the ferrets aren't able to get them off easily. Just make sure that you can put a finger between the collar and their neck and your guys will be fine. Try to make one...you'll find that it stays on sooo much longer than those cat collars. Melanie and the gang (Maggie, Gizma, and Norman) [Posted in FML issue 1883]