Reposhing this item I purchased from @2happyhearts97, who had only used it a couple of times. It looks brand new. I unfortunately flubbed my measurements, and it was too large for my pup. I included a photo of my derpy dogs wearing their appropriately sized Ruffwear collars for reference! COLOR: Sunset (sold out online in this color/size combination!) SIZE: 14" - 20: (36-51cm) FROM THE MANUFACTURER: The Chain Reaction Collar is a martingale collar with chain. It combines reflective Tubelok™ webbing and a short section of stainless steel chain. The limited-cinch martingale design is popular among dogs who have a knack for slipping out of traditional collars. Packed full of Ruffwear’s signature collar features: separate ID tag attachment point, a silicone tag silencer, and strong and comfortable webbing that holds its color. MATERIALS: Chain: Stainless steel Leash Connection Point: Anodized 6061-T6 aluminum V-ring Webbing: 100% polyester Tubelok™ webbing Other: Silicone tag silencer Made in Vietnam CARE: Hand wash Mild detergent Air dry