The Kazoo collars, leads, harnesses and tethering products are manufactured using the finest nylon webbing. Nickle plated metal and plastic hardware. The Kazoo Classic Collar has everything you love about a basic dog collar with the added personalization and durable hardware. Superior hold but is also super soft to the touch, with the highest quality nylon, no need to worry about the collar fraying or the color fading. Key Features: Finest nylon webbing Nickle plated metal and plastic hardware Durable Superior hold and super soft to the touch Size Guide: Small - 12mm Collar Width, 26-33cm Neck Size Medium - 15mm Collar Width, 32-40cm Neck Size Large - 20mm Collar Width, 40-49cm Neck Size Extra Large - 25mm Collar Width, 48-59cm Neck Size