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. These puppy ID collars come in 14 different bright colors to help easily identify puppies and kittens. Perfect for pet owners and breeders to track growth, health, weight, behavior, and more. Features: 1. 14 distinct colors for easy identification of similar-looking pets. 2. High-quality, well-made, super-soft, and adjustable for a comfortable fit. 3. Breakaway safety buckle releases under pressure, ensuring pet safety while staying secure during play. 4. Includes two weight tracking charts for monitoring pet health. 5. Easy to clean and fast drying; machine washable. 6. Suitable for small animals such as cats, kittens, bunnies, guinea pigs, and more. Package Includes: 14 pcs collars and 2 paper cards. Material: Soft nylon. Small: 17.8cm - 26cm length; 1.0 cm width. Medium: 21.6cm - 34cm length; 1.0 cm width. Features: Easy to recognize, soft, adjustable, breakaway, safe. 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.