QUANTITY - This set includes 12 collars in assorted different colors, which can fully meet your daily needs. You can dress up your pet with different colors.They are distinct which makes you easier to identify similar pups. TARGET AUDIENCE - Design for puppies from birth to 10 weeks old,also can be used for cat,kitten,bunnies,guinea pigs and other small animals. SAFETY - Strong safety release buckle, easy to open and close. ADJUSTABLE PUPPY COLLAR - Adjustable size from 7.5 to 12.6 inches in length, you can adjust the length according to the size of your pet to make them more comfortable. MATERIAL - The puppy collars are made of PVC and PP, durable and soft material, non-toxic, will not harm your pet's health, easy to clean.