You can easily rejuvenate the sharpness by using 3 types of whetstones (2 types of diamonds, ceramic), without having to adjust the angle yourself Compact size stores easily in sink drawers or under sink Size: 5.6 x 2.0 x 2.2 inches (14.1 x 5.1 x 5 Weight: 3.6 oz (96 g) Materials: Main body: ABS (Acrylonitrile Butadiene Styrene) resin, Transparent cover: AS (Acrylonitrile Styrene) resin, ABS (Acrylonitrile Butadiene Styrene) resin, Elastomer resin, whetstone / Diamond whetstone / Ceramic whetstone / Country of Origin: Japan; This product is a double-edged product