Pet Premium Square Pattern Nylon with Bell Pet Dog Collar Design everything from pet anthropomorphic concept: thoughtful, lively, beautiful, equality. Use the latest super polypropylene, solid and strong flexibility, zinc alloy metal fasteners used through superior plating surface treatment process, fantastic durability. To ensure the best quality: each process through the most rigorous testing, including tensile testing, plastic and metal fastener strength test, resistance to oxidation and corrosion tests. In particular, attention to detail: Every detail of the deal to go through rigorous testing. Even after a year or so to use, wash the dust, still like new out, long service life. 2 size available, please check each size detail in picture of size table.