Hayabusa 4000 sharpening stones are used for sharpening knives on Hapstone and Edge Pro knife sharpeners. Narrow stones (12 mm wide) are suitable for recurved blades. Hayabusa stones are made of aluminum oxide. All Hayabusa stones are 5-6 mm thick and are mounted on high-quality aluminum blanks.
Hayabusa 4000 is part of Naniwa Kiken series which includes Kuroto 1000, Hayabusa 4000, Fuji 8000 and other. Kiken series does not compose the set of even progression but offers "repository" of premium stones to make a custom stone set.
Hayabusa 4000 is preliminarily lapped and does not require lapping after purchase.
Hayabusa 4000 should be used with water as a lubricant. Soak the stone in the water for 5 minutes before use. Never store Hayabusa stones in water. Never dry Hayabusa stones near heat.
If you have a question regarding this product, please feel free to ask.