Features:1. Made of natural emerald, very durable and comfortable to use.2. Comes with two draining bases, non-slip and safe to use.3. Convenient and easy to sharpen knives.4. Super fine sharpening stone, perfect fit for knives fine-grinding and polishing.5. Sharpening stone is for knives, chef knives, scissors, chopper, cutting tool.Specifications:Material: Natural EmeraldBase Material: Silica GelGrit Type: 10000 Grit Color: As the picture shownSharpening Stone Size: Approx. 200 x 50 x 25mm / 7.87 x 1.97 x 0.98inchWeight: Approx. 800gDirections:1. Soak the stone in water about 15 minutes before using, saltwater is better.2. Sharpen the knife in the order of the first rough then precise.3. When you sharpen the knife, hold the handle of the knife with the right hand, left hand fingers are lightly pressed to the edge of the knife, move in a clockwise direction.4. The sharpening angle is best from 10 to 20 degrees.5. Do not scrape the slurry off when grind, knife can be ground more sharp with the slurry.Package Include:1 x Sharpening Stone2 x Draining BaseNote:1. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.2. Only sharpening stoneand 2 draining bases, no other stuff included.