1.Size for Martingale Chain Dog Collars：The collar is available in three sizes, small, medium and large, suitable for large medium dogs and small dogs, with necks ranging from 10 inches to 24 inches, and the collar is adjustable in length. S-(dog's neck10 -15inches), M-(dog's neck15-19inches), L-(dog's neck19-23inches). 2.Dog Collars Color: black, blue, orange,pink, red, purple, green, sky blue. It would be a great gift for your dog. 3.The Material of The Dog Collar: Comfortable Soft Padded sewn on the nylon webbing, Comfortable,durable,breathable and light. The stainless steel chain is sturdy and not rust. The collar easy to clean. Long service life. 4.No pull and safe: Reflective nylon collars with stainless steel chain. The stainless steel chain can be stretched to relieve tensile force, s dog's Neck and your hands will more relaxed. There are reflective lines on the collar. When the dog walks at night , the lights and carlights will make the dog collar have a good reflective effect, making the dog safer at night. 5.After-sales service: When you receive the package, if you are not satisfied, please feel free to contact us, or return the package for free.