Tamago 4000grit, sharpening stone.
Tamago 4000 is a great finishing stone. A hard stone with a good almost creamy sharpening feel. Suitable for kitchen knives, not too smooth finish. For planer blades and chisels, stone is a great halfway stage, after which a 6000-10000 grit stone is used for finishing. This is the so-called Splash&go stone, which means you don't have to soak it. The stone was made by Imanishi from Kyoto, known for its quality.