Hamilton Bad to The Bone Nylon Adjustable Dog Collar with Bones on Blue 100% premium custom nylon with fashionable ribbon overlay Unique O-ring placement for maximum strength and durability Custom buckle insert enhances the look All cuts are finished away from the neck to avoid irritation Adjustable collar, lead and easy-on step in harness available in 3/8 inch width When measuring pet's neck or chest to ensure proper and comfortable fit, add 2 inches.