Our color-coded Total Pet Health Puppy ID Collars have removable number rings to increase your options for identifying large litters. Comes in a color coded eight pack. Toy collars measure 1/4"W and adjust to fit necks from 5" to 8". Regular collars measure 1/2"W and adjust to fit necks from 6" to 12". Large collars measure 1/2"W and adjust to fit necks form 10" to 16".