Empire Professional Combs are exclusively from NITRILE RUBBER – a 100% professional material combining proper rigidity and flexibility to be absolutely guaranteed. Nitrile rubber is the quality alternative to cheap plastic and will not absorb sterilization solution, perms, conditioners, shampoos, oils, water, etc., and can be wet or dry sterilized. Teeth are perfectly matched to eliminate drag split ends or scratching. Combs are packaged by the dozen in a chemically inert sterilizing container (super-ster) which is disposable or reusable. Proudly made in the USA.