Aiwatani Koppa - Japanese Natural Razor Hone Sharpening/Finishing Stones - Choose Your Stone

Stone No. 1035 measures at its max dimensions 74 mm (2.91 in) wide × 120 mm (4.72 in) long × 22 mm (0.87 in) thick & weighs 493g (17.39 oz / 1.09 lbs).
Hardness: 4.2
An extremely beautiful and highly performing Aiiwatani Kiita. These stones were stored in the warehouse of a wholesaler since the 1960's. They recently found them and were excited to offer them. This stone is a beautiful yellow/orange Kiita Tamagoiro (Egg colored) stone from the Tomae layer of the Aiiwatani mine. This stone is quite hard and dense but has a lovely, smooth and gentle feel when honing on water only. There is no visible self slurry and a moderate amount of swarf is released. When slurrying this stone, the grit rich mud cuts the steel and blackens the slurry immediately. The stone can remove medium grit scratches and works best as a final finisher for razors, knives and tools. The stone is unique in the sense that it has high hardness and density but feels extremely smooth and gentle in use.w

Stone No. 1036 measures at its max dimensions 74 mm (2.91 in) wide × 120 mm (4.72 in) long × 21 mm (0.83 in) thick & weighs 475g (16.76 oz / 1.05 lbs).
Hardness: 4.2
This hone has a few surface holes but they do not affect honing or scratch. they could present issues in the future however, so the stone is marked down accordingly. This stone is medium hard and quite fine. best for standalone use when finishing razors with slurry and water only. However, the stone can be used with Nagura progressions as well. great for knife polishing and sharpening.

Stone No. 1037 measures at its max dimensions 73 mm (2.87 in) wide × 120 mm (4.72 in) long × 17 mm (0.67 in) thick & weighs 395g (13.93 oz / 0.87 lbs).
Hardness: 4.4
A double sided, firm fast and fine finisher. Beautiful yellow Asagi base with orange Nashiji running throughout the stone. Fast inky cutter with firm base and minimal self slurry. Performs a lot like many Nakayama Tomae but a bit less hard and fine. Very versatile as it's firm enough to be effective when used with Nagura progressions and fast enough to be used as a standalone hone. Also great for knife polishing and sharpening. 

Stone No. 1038 measures at its max dimensions 75 mm (2.95 in) wide × 120 mm (4.72 in) long × 19 mm (0.75 in) thick & weighs 441g (15.56 oz / 0.97 lbs).
Hardness: 4.6
A slower, harder and finer finisher. Beautiful detail within the Green Asagi base. Perfectly clean surface with zero distractions. This is perfect for razor final finishing with Nagura or stand alone. Slurry speeds up the cutting strength. Noticeably more firm and fine than Kiita's. Great for knife polishing/sharpening where a brighter, more fine polish or edge is desired.

Stone No. 1039 measures at its max dimensions 73 mm (2.87 in) wide × 120 mm (4.72 in) long × 17 mm (0.67 in) thick & weighs 382g (13.48 oz / 0.84 lbs).
Hardness: 4.5
A double sided, fast cutting firm Kiita with Nashiji. very high quality and extremely versatile with fast cutting speed and extremely fine. Great for razors finishing standalone or with Nagura progressions. Very unique feedback with elastic feel. Firm base but forgiving similar to many Nakayama stones. Extremely high quality stone which is great for all blades.

Stone No. 1040 measures at its max dimensions 74 mm (2.91 in) wide × 120 mm (4.72 in) long × 17 mm (0.67 in) thick & weighs 372g (13.12 oz / 0.82 lbs).
Hardness: 4.6
A very firm and beautiful light yellow/green Asagi base with Goma. slower and very fine. perfect for final finishing of razors using Nagura progression. very affordable stone to experiment with Mikawa Nagura. a bit hard and fine for knives, especially for steels containing alloying elements and certain stainless steels.

Stone No. 1041 measures at its max dimensions 74 mm (2.91 in) wide × 120 mm (4.72 in) long × 18 mm (0.71 in) thick& weighs 382g (13.48 oz / 0.84 lbs).
Hardness: 4.7
A hard and slower but easy going Asagi. no lines or inclusions. Very firm base but cushioned and quite feel. very smooth. Great for razors final finishing when used with Nagura progressions. Also good for standalone use for razors. This stone can be used for knives where a brighter, finer polish is desired. 

Stone No. 1042 measures at its max dimensions 73 mm (2.87 in) wide × 120 mm (4.72 in) long × 21 mm (0.83 in) thick & weighs 436g (15.38 oz / 0.96 lbs).
Hardness: 3.5
The softest stone of the lot. Water absorbent and self slurrying but still quite fast cutting. For it's softer nature, still quite fine. Beautiful subtle red and pink base color. Very mild and easy going with user friendly written all over it. Great for stand alone finishing and finishing knives. Also great for stainless and alloy containing carbon steel such as Aogami Super.

Stone No. 1043 measures at its max dimensions 73 mm (2.87 in) wide × 118 mm (4.65 in) long × 20 mm (0.79 in) thick & weighs 473g (16.69 oz / 1.05 lbs).
Hardness: 4.3
Another beautiful Iromono like #1042 but this stone is much more firm and fine. This stone is quite user friendly for its hardness and faster than the other Iromono as well. Best when used as a standalone hone for finishing razors with its efficient cutting ability and user friendly feel. Great for knives and tools!