Protect your dog from potentially dangerous accidents-Rogz Safety Collars have a quick-release magnetic buckle that opens when pressure is applied, reducing the chance of strangulation or injury while engaging in two-dog play. Added elastic behind the quick-release buckle to avoid losing the collar entirely if and when snagged. A single reflective yarn is woven into both edges of the webbing for improved nighttime visibility. Polyamide webbing/plastic and magnetic parts. Spot clean. Medium: width 16mm/5.8\\\", length 270-390mm/10.5-15\\\" Large: width - 20mm/3.4\\\", length 330-480mm/13-19\\\"Xlarge: width - 25mm/1\\\", length 420-660mm/16.5-25\\\"