I guess I am the oddball on collars here. After looking at leather straps, nylon straps, and collars with skimply elastic loops in one small section, I chose for my two ferrets collars that are nylon with elastic inside the full length of the nylon woven mesh. I found them at the Super WalMart. Because they were originally 8" long, I cut down and the end melted to stop fraying. Being made of woven nylon, the hasp can go in anywhere, allowing for a comfortable, custom, and secure fit. I chose this fully elastic collar because I wanted to make sure that if they get hung up on something, they can pull out without much problem before they hurt themselves. After the first 5 minutes of a St. Vitus Dance protest, each ferret gave up trying to take off their collar and now it is not a concern by either ferret. My experience is that a collar comes off of one of them about once a week, usually because the name tag got hung up in the track of the glass shower stall sliding door on the bathtub. That's good to me because then I know it is slipping off like it should, otherwise I'd find myself with hung ferrets. Its very simple to put the collar back on a squirming ferret as it doesn't have to be unbuckled, just stretched out and quickly placed over the moving head. Each collar has a small jingle bell and a really great name tag system I picked up at PetsMart. Its a small metal cannister with a screw on lid. Inside is a slip of paper with all of the info you want someone to have who may find a lost ferret. I've never seen one come open on its own. The bell and tag are right on the D ring in the collar and jingle loud enough to let somone know where each ferret is at any time, especially when opening a door to a ferret-forbidden room (from either side). [Posted in FML issue 1884]