SMALL: 17.8cm - 26cm Neck, MEDIUM: 21.6cm - 34cm Neck. Width: 1 cm. 14 pcs/set, come with 14 different colors for easy identification. Designed 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 a safety quick-release buckle for safe wearing and removal. Includes two weight record keeping charts for daily or weekly tracking, ideal for breeders. The metal D-ring allows attachment of ID tags or leashes. These puppy ID collars come in 14 different bright colors to help you easily identify your puppies and kittens. The collars are perfect for pet owners and breeders to track growth, health, weight, behavior, and more for a healthier life.Features: 1. 14 different bright colors for easy and clear identification of similar-looking puppies. 2. High-quality, well-made, super-soft, and adjustable for a comfortable fit. 3. Breakaway safety buckle releases under pressure, providing safety while staying secure during play. 4. Includes two weight tracking charts, ideal for breeders, owners, and farmers monitoring pet health and development. 5. Easy to clean and quick to dry; machine washable. 6. Suitable for small animals such as cats, kittens, bunnies, guinea pigs, and hamsters.Package Includes: 14 pcs collars and 2 paper charts Material: Soft nylon Small: 17.8cm - 26cm length; 1.0 cm width Medium: 21.6cm - 34cm length; 1.0 cm width Colors: Purple, orange, yellow, brown, black, silver, blue, fluorescent green, green, hot pink, light pink, red, sky blue, navy blue Suitable for: Puppies, kittens, and small animals such as hamsters, bunnies, and guinea pigs Note: Please measure your pet's neck circumference to ensure proper fit before purchase.