Description The Berta Hand Held Knife Sharpener from Chroma makes quick work of keeping your cutlery’s performance on point! This hand held sharpener features one ceramic wheel, made of the same material as the rest of Chroma’s whetstones. Berta is suitable for both professional and household knives, making it the perfect tool for the daily maintenance of your knives’ edges. Notice: Chroma suggests that professional knives should not be sharpened solely with tools like Berta, but also with their corresponding Chroma whetstones from time to time, to maintain their top quality. DEsigned by Sebastian Conran.