Circle T Black Rolled Leather Dog Collar - 16 in. Coastal Pet Products Circle T Leather Latigo Round Dog Collar, 5/8 by 16-Inch, Black Circle T Black Leather Round Dog Collar, 5/8", adjustable sizing to fit necks 11.5" to 14". Great alternative to nylon. Excellent for longhair dogs or dogs with sensitive skin. Handcrafted. Strong and extremely durable. Made of full grain, top quality leather that has been vegetable tanned