Small - Adjusts from 10 to 16 inches Medium - Adjusts from 14 to 20 inches Large - Adjusts from 18 to 26 inches With this bulk pack you will receive 100 assorted color adjustable dog martingale collars. Great for Vets, Rescues, Groomers, Shelters and any cause for dogs. Our Martingale Dog Collars are a great alternative to traditional choke chains! These Martingale Dog collars work just like a choke collar, but without the chain. The collar tightens when a dog pulls, and relaxes when the pulling stops. Prevents dogs from backing out of their collars. Great collar for breeds with large necks and small heads like greyhounds. Bulk Pack includes 100 Assorted Collars, Colors will vary and some will duplicate depending on current inventory. Material: Nylon or Polyester and Metal Collars are available in three adjustable sizes. Additional Details ------------------------------ Product description: Small - Adjusts from 10 to 16 inches Medium - Adjusts from 14 to 20 inches Large - Adjusts from 18 to 26 inches With this bulk pack you will receive 100 assorted color adjustable dog martingale collars. Great for Vets, Rescues, Groomers, Shelters and any cause for dogs. Our Martingale Dog Collars are a great alternative to traditional choke chains! These Martingale Dog collars work just like a choke collar, but without the chain. The collar tightens when a dog pulls, and relaxes when the pulling stops. Prevents dogs from backing out of their collars. Great collar for breeds with large necks and small heads like greyhounds. Bulk Pack includes 100 Assorted Collars, Colors will vary and some will duplicate depending on current inventory. Material: Nylon or Polyester and Metal Collars are available in three adjustable sizes.