ZEE.CAT Skull | Cat Collar | Fully Adjustable | Ultra Durable | Super Light | Soft Polyester | Breakaway Buckle | Bright Colors | Unique Prints | One Size Fits All | 7.8 - 11.8" Our Zee.Cat collars are made of super soft polyester and are one size fits all. The buckle is a breakaway buckle that automatically opens if your cat gets stuck. Attached to the D ring is a small bell so you can find them during those classic hide and seek sessions.