Casual Canine® Natural Cork Collars with Bamboo Linings are earth-friendly dog collars made with natural cork, soft bamboo, and natural dyes. Each adjustable collar features a plastic buckle and a nickel-plated D-ring. Natural, neat and completely unique! Made with natural cork on the outside and soft bamboo inside. Colorful floral patterns are done in natural dyes. Adjustable collars have plastic buckles and nickel-plated D-rings. Collars are available in the following sizes: 3/8" Collar adjusts to fit necks 6"-10", 5/8" Collar adjusts to fit necks 10"-16" , 5/8" Collar adjusts to fit necks 14"-20" , 1" Collar adjusts to fit necks 18"-26".