Essential for breeders, these identifiers brightly colored necklaces greatly facilitate the identification of members of the litter from the start. Made of Velcro, its unique design allows us to adjust measured by the growth of the puppies from birth until at least 8 weeks (for collars 7-33cm). The package contains 12 individual collars (10mm x 35cm), one size fits all races. These collars for puppies are safe, non-toxic, easily identifiable, washable and reusable vivid colors. This set of necklaces is a great help for breeders from now, they will not want to raise without them!