Pure copper scrubber prevents the growth of bacteria on the scrubber. Value pack of 20 It is very useful for removing stains from cutting boards and wok pots. Caution: This is a metal scrubber, so please do not use on products that are prone to scratches. Do not use disinfecting agents (moisturizing agents) as this may cause copper corrosion. As metal itself is a soft material, it may be damaged if hit it hard or put on a strong load.