dogIDS Waterproof Safety Dog Collar with Engraved Nameplate GUARANTEED FOR LIFE: This collar is made in the USA from durable, weather resistant soft grip poly coated nylon webbing. This collar is also waterproof, smell resistant and made with corrosion-proof stainless steel hardware. Guaranteed for life! BUILT-IN NAMEPLATE: Collar comes with a stainless steel rivet on nameplate already installed and laser engraved with the most important information about your pet. CENTER RING FOR SAFETY: The extra center ring on this collar serves as a pivot point on the collar if your dog should get stuck on something when they are out having adventures. Prevents choking and injury. FOR MEDIUM-LARGE DOGS: This collar is heavy duty but the hardware and strap can be a bit too large for small pooches. Recommended for dogs 40lbs and up. Please read sizing information below to determine best size. SIZING: 1 inch wide and fits dogs with a neck size of 18-22 inches. To determine collar size, please measure your dogs neck with a sewing tape or string. That size will be your dogs neck size. The collar sizes directly align with the neck size for the middle adjustment hole on the collar and it can be adjusted up and down 2 inches. See sizing image in product images for more information.