I could not be more thrilled to introduce the new and improved collar and leash options here at RNF! Waterproof, odor-proof, and adventure-ready, these collars have it all! These are not only waterproof and odor-proof but also a more eco-friendly option with their low carbon footprint! We use solid brass hardware which will never rust or corrode and an added locking agent for maximum durability. CARE INSTRUCTIONS: As the solid brass begins to oxidize and is exposed to natural elements, it will start to patina, creating a darker coating. To restore your solid brass shine, our preferred method is to coat the hardware with a tomato-based product. Ketchup, tomato paste, and tomato sauce all work equally well. Coat for one hour and wash with soap and water, it'll be good as new! For everyday care, soak with soap and water for 30 minutes! Due to the weight of these, we do not recommend any pups under 30 lbs. using this standard 1' option.