Black Martingale Adjustable 10 to 16 Inch Dog Collars Bulk Packs Quick Release Buckles for Off Leash Adventures! Our martingale design allows you to set a length beyond which collar cannot constrict around pets neck. When tension is applied, collar constricts evenly, dispersing the pressure to prevent choking or injury. Durable nylon material is comfortable in all types of weather. Convenient off release for off lead adventures. Tightens when dog pulls, but loosens up for a comfortable and not too tight fit. Great for training and everyday activities. Available in bulk packs of 25, 50, 75, or 100 Collars! Additional Details ------------------------------ Product description: Black Martingale Adjustable 10 to 16 Inch Dog Collars Bulk Packs Quick Release Buckles for Off Leash Adventures! Our martingale design allows you to set a length beyond which collar cannot constrict around pets neck. When tension is applied, collar constricts evenly, dispersing the pressure to prevent choking or injury. Durable nylon material is comfortable in all types of weather. Convenient off release for off lead adventures. Tightens when dog pulls, but loosens up for a comfortable and not too tight fit. Great for training and everyday activities. Available in bulk packs of 25, 50, 75, or 100 Collars!