The Harness With Stretchy Stroller is A Safe and Stylish Way to Walk Your Favorite Furry Friend. It is Designed to Conform to Your Critter's Contour. It is an Adjustable Small Size that Fits Small Ferrets, Pet Rats, & Small Critters. It has Velcro Straps & E-Z" Snap Buckle. This device helps to Ensure that the Pet Can Not Get Away & Its Elasticity Helps Prevents Injuries While Walking Your Pet. Size: 2.5" Adjustable.