Rolled Genuine Leather Martingale Dog Collar Choker Black 7 Sizes Soft, strong, durable, and light Martingale Dog Collar made of high quality genuine rolled leather Features nickel-plated hardware for durability and resistance to rust and tarnishing Comfortable collar for daily walks and training Trimmed with thick waxed thread Available in 7 sizes. Please measure dog's neck for proper fit. * Size #1 - Closed:6.5"; Open: 8.7.5" * Size #2 - Closed:8.5"; Open: 10.75" * Size #3 - Closed:10.25"; Open: 12.5" * Size #4 - Closed:12"; Open: 14.25" * Size #5 - Closed:13.75"; Open: 16.25" * Size #6 - Closed: 15"; Open:18.25" * Size #7 - Closed: 17"; Open: 20.25"