UrbanPup Red Leather Diamante Collar & Diamante Bone Charm (Medium - Dog Neck Circumference, adjusts: 11" to 14" / 28cm to 35cm) 3 Sizes Available for Small / Medium Sized Breeds Medium (Neck Circumference, adjusts: 11" to 14" / 28cm to 35cm). Width 3/4" / 19mm