Martingale Genuine Leather Dog Collar Choker XLarge 24"-28" Neck, Mastiff, Cane Corso, Great Dane Soft, strong, durable, and light. Collars are measured 28" all the way open, it measures 24" in closed position Made of high quality leather and chrome plated steel for durability and resistance to rust and tarnishing Width: 3/4". Trimmed with thick waxed thread. Will fit 24"- 28" neck - Please measure dog's neck before you order