Marshall Ferret Bell Collar - GreenMarshall Ferret Bell Collars let you keep track of your ferrets even when they're out of view. These must have collars are available in a variety of colors, with simple snap buckle closures and easy adjustment for a comfortable fit. Lets you keep track of ferrets at all times Simple snap buckle is easy to put on and remove Easy to adjust for a comfortable fit 3. 9" max neck circumference