Masamoto Shiro-ko Hongasumi Sobakiri
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Price: $1,050.00
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Masamoto Shiro-ko Hongasumi Sobakiri
Item #: HMA-CSO
Size: 11.7" (30cm)

CAUTION: Moisture Causes Rusting and Discoloration




Steel Type

(White steel)



Saya Cover

Not Included


Single Edge

Blade Length

11.7" (30cm)

Handle Material


Bolster Material




* Hardness Rockwell C scale

For Left-Handed Customer

  • For this knife, the LEFT-HANDED blades need to be special ordered to Japan and the cost is an additional 50% of the price of the right-handed knife. Please allow us to take 4 to 6 weeks.

Did you know?

  • Korin offers their customers a free maintenance service for all traditional Japanese knives!

  • The initial blade serves as a sharpening guide in the future. Free initial sharpening and uraoshi sharpening is available with every purchase. Please be aware that sharpened knives are not eligible for returns.

Menkiri-bocho are specialized noodle knives. Once the noodle ingredients are mixed, the dough must be rolled out very flat, folded over several times, and then cut into long thin strips. There are many specific features of a menkiri-bocho that make it essential when working with noodles. In order to cut thin strips the knife must be very sharp, the blade must extend to the end of the handle to cover the width of the dough, and the blade must sit completely flat against the cutting board. If there is any space between the blade and the cutting board, it will not cut the dough all the way through and will ruin the structure of the noodle.

Masamoto sobakiri-bocho are specialized soba noodle knife. They are traditionally designed and crafted hongasumi style knives that are forged out of soft iron and white carbon steel. Each blade is hand sharpened when packaged, therefore does not need to be sharpened the knife out of the box.

General knife care tips and warnings

  • Never wash knives in the dishwasher
  • This is not stain resistant. It will rust and discolor after cutting acidic ingredients or if one leaves it wet.
  • Improper care will result in chipping.
  • Please wipe knives dry after use to prevent rusting. Korin recommends wiping carbon knives with tsubaki oil to keep moisture off the knife.
  • Western style knives sold at KORIN have significantly thinner blades than typical Western knives. Use of honing steels or sharpening machines may result in chipping.
  • We advice all customers to always use sharpening stones to sharpen or hone knives.


Please be cautious when inspecting carbon knives with wet hands after purchase. We ask customers to inspect all knives prior to using, and will not accept returns on damaged goods. In the event you receive a rusted knife, please call customer service within 48 hours, and we will be happy to assist you.

For more information, please check our pages on different types of sharpening stones or sharpening tips.

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Item #: HA-1008
Size: 3.8oz
100% Japanese Camellia Oil
List Price: $11.00
Price: $11.00