The Marshall Bell Collar is designed to fit ferrets of all sizes. The 3/8 inch nylon collar is fully adjustable with quick snap buckles for easy on/off. Bell enables ferret to be heard when out of cage. Escape proof design when adjusted properly. Designed to fit all size ferrets. The collar is fully adjustable with quick snap buckles for easy on/off. Bell enables you to know where your ferret is at all times when out of cage.. Durable 3/8 Flat Nylon With A Quick Snap Buckle.: Size: 3/8 INCHES: Color: GREEN