ITEM NAME:Gear Martingale Adjustable Choke-Style Dog Collar Red O7Q7 Gear Martingale Adjustable Choke-Style Dog Collar Red O7Q7 Perfect for Training – Featuring the convenience of adjustable sizing paired with the safety of a limited range, this martingale collar is a good choice for pet parents looking for a safe, gentle way to train on leash. Safe Design – Each martingale collar is equipped with a limited closure design which ensures that the collar will not ever fully close or injure pets It works by adjusting in size as you apply pressure to the leash, giving your pet the signal to slow down without choking. Material: Nylon Adjustment Range: Neck Circumference 40-74cm / 16 - 29 inch, Width 2.5cm Colour: Red Quantity: 1 Pcs Package Contents: 1 x Dog Collar Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.