Guardian Gear Martingale Adjustable Choke-Style Dog Collar More Control  Provides the limited range of a standard choke collar for additional control but features the convenience of adjustable sizing for added comfort Perfect for Training The collar size adjusts as pressure is applied to the leash, making this collar the ideal choice for puppies learning to walk on a 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 A Wide Range of Sizes  Comes in three sizes ranging from 13 inches to 34 inches for a comfortable, safe fit on dogs of a wide variety of breeds Various Colors Available  Choose the style that suits your pups personality; Available in black, blue, light blue, pink, purple and red