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 monitoring pet health. The metal D-ring allows attachment of ID tags or leashes. The puppy ID collars come in 14 different bright colors to help identify puppies and kittens easily. These collars are ideal for pet owners and breeders to track growth, health, weight, behavior, and more to support a healthy life. Features: 1. 14 different bright colors for clear identification of individual pets. 2. High quality, well-made collars that are 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, useful for breeders, owners, and farmers monitoring pet development. 5. Easy to clean and quick to dry; machine washable for convenient care. 6. Suitable for small animals such as cats, kittens, bunnies, guinea pigs, and hamsters. Package Includes: 14 pcs collars and 2 paper weight tracking cards 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 other small animals Note: These ID collars are designed for small pets. Please measure your pet's neck circumference to ensure proper fit before purchase.