SMALL: 17.8cm - 26cm Neck, MEDIUM: 21.6cm - 34cm Neck. Width: 1 cm. 14 pcs/set, come with 14 different colors, easy identification. Design suitable for puppies from birth to 10 weeks old. Can also be used for cats, kittens, bunnies, guinea pigs and other small animals. Made of soft nylon material, washable, colorfast and reusable. A great tool for breeders or farmers to easily identify animals. Easy to adjust with safety quick release buckle, safe to wear and remove. Includes two weight record keeping charts for daily or weekly weight tracking for breeders. The metal D ring allows attachment of ID tags or leashes. Our puppy ID collars come in 14 different colors to help you identify your puppies and kittens easily. Brightly colored collars are ideal for pet owners and breeders to track pups and kittens as they grow, helping monitor health, weight, behavior and more for a healthier life. Features: 1. 14 different bright colors, easy to distinguish and identify similar pups. 2. High quality, well-made, soft and adjustable for comfort. 3. Breakaway safe buckle releases under pressure, safe for pets while remaining secure during play. 4. Includes two weight record keeping charts, ideal for breeders, owners, and farmers monitoring pet health and weight. 5. Easy to clean and quick to dry, machine washable. 6. Suitable for smaller animals such as cats, hamsters, bunnies, guinea pigs and more. Package Includes: 14 PCS & 2 Paper Cards Material: High quality soft nylon Small: 17.8cm - 26cm in length; 1.0 cm in width Medium: 21.6cm - 34cm in length; 1.0 cm in width Features: Easy to recognize, soft, adjustable, breakaway, safe Main Colors: Purple, orange, yellow, coffee, black, silver, blue, fluorescent green, green, hot pink, light pink, red, sky blue, navy blue Target Animals: Puppies, cats, and other small animals such as hamsters, bunnies, guinea pigs and more Special Note: Our ID collars are designed for small pets. Please ensure your pet's neck size fits before purchase.