This is a knife sharpener from Kai SELECT! This simple sharpener doesn't require you to adjust the angle yourself, making it easy to use and very convenient for everyday use. It has three different types of whetstones on one tool, and by using them in order, you can easily restore the sharpness of a dull knife. ◆ Sharpening in 3 STEPS: STEP 1: Use the coarse diamond whetstone with high grinding ability to grind away the worn blade edge. (Approximately 10 strokes) STEP 2: Use the ceramic whetstone to thin the blade edge, improving sharpness. (Approximately 10 strokes) STEP 3: Finally, use the fine ceramic whetstone to smooth the tip of the blade. (Approximately 5 strokes) Anyone can easily use it. It comes with a slide-type transparent cover that completely encloses the body, so after the work is done, the fine metal powder produced during sharpening won't spill. Body: ABS resin (heat resistance 80 degrees Celsius) Transparent cover: AS resin, ABS resin, elastomer resin Whetstones: Diamond whetstone, corundum ceramic whetstone Size details Body size: 141 x 51 x 55mm Weight: 96g Please feel free to comment if you have any questions!