You can now choose the stiffness of polisher that best suits your specific requirements to clean plaque and stains caused by coffee, tea, nicotine, red wine, etc. These new coloured prophy polishers are manufactured in 3 types of medical grade synthetic polymer. They are designed for use with STODDARD Prophy polishing paste Material - medical grade synthetic polymer Colour - Purple Stiffness - medium Shank - RA Contents - 100 per bag"