[Tennen Toishi] Yamashiro Meito Stone, 458gwith Iyo Meito Stone, 581g total (10 pieces)from Kyoto Umegehata, Okuden, Nakayama, etc.

Local Production, Local Strength!!

Please refer to the upper section for box dimensions. Weight indicated is the packaged weight. Please use this as a reference for size comparison.

The grain is clear, making it easy to work with and yielding a high rate of usable material when dividing the stone. We encourage you to actually perform facing and dividing yourself to verify the properties and performance differences of the whetstone.

It contains a variety of types, sizes, and shapes. For blades you intend to sharpen, use a stone with ample size to create a flat surface. Otherwise, divide the stone into smaller pieces and use it similarly to sharpening Japanese swords.

It is composed solely of **first-class mineral deposits** from the easternmost part of Kyoto City, Ukyo Ward, along with comparative samples.

The Umegehata whetstone comes exclusively from Mukonouchi-cho in Umegehata, known for its Nakayama and Koyama deposits, and extending to Okudono-cho, the origin of Kyoto whetstones, and the renowned Shobudani Valley.

This is a set that doesn't compromise on quality, avoiding stones bulked up with inferior material. The authenticity is revealed by how it splits. The stone forging was primarily carried out by trainees under the supervision of an instructor with over 15 years of experience in the Yamamoto forging technique. We believe they have successfully split, sorted, and created a diverse range of colorful pieces, so please check the images.

We encourage you to try splitting it yourself and observe the significant differences in its properties, including the vibrant color variations. (Prepare a flathead screwdriver, mallet, safety glasses, and gloves.)

Having even one soft, reddish-pink piece is a stroke of luck. (Please understand this depends on the lot.)

Clear grain in the original stone easily produces a flaky slurry resembling a film.

Sharpening particles with directionality are arranged on the flakes, resulting in surprisingly strong sharpening power.

The grain size increases with the breakdown of the flakes when water supply is restricted.

The sliding between flakes is lubricated by the crushed slurry of sticky feldspar and mica minerals, creating a smooth gliding sensation.

Historically, it’s akin to replacing the konbu seaweed used to slide heavy stones for Osaka Castle’s walls with crushed flakes.

Excessive pressure during sharpening with too many unbroken flakes can create shallow scratches on softer metals due to the overlapping flakes and the strong sharpening power originating from Yamashiro Province.

Adjusting the pressure, sharpening angle, slurry amount, and water supply will improve your technique and significantly reduce these shallow scratches.

The visible results allow for easy self-assessment of your skill level, making it a recommended approach.

Experienced flake users will likely discover that the “konbu attack” – using this technique – is very helpful when dealing with stubborn or overly hard stones that were previously considered unusable.

It may rekindle your motivation to re-challenge previously abandoned, difficult-to-sharpen blades. It’s worth noting that skilled whetstone artisans typically remove unruly grain patterns during the forging process.

The market tends towards shortcuts in manufacturing, prioritizing size and thickness for higher profit margins, which means there will likely be opportunities to utilize the soft, reddish-pink slurry.

・Includes one completed 458g whetstone. Size is based on the outer dimensions of the box. One piece, including the outer box and rough forging stone, weighs 581g. These are whetstones from Iyū Province and the original Yamashiro Province, ranging from mid-to-high grade, with miners hand-writing the name on the stone to combat counterfeiting and mislabeling. The forging shown in the images is sealed with extra space. The raw stone does not have a name written on it, so please touch and judge its properties yourself. This is geared towards those with a competitive and training-oriented mindset. ・Neutral and rust-resistant whetstones from Tangawa Village, Iyū Province, dating back to the Edo period, revived after half a century!! https://bit.ly/IyoMIkantsubu The outer dimensions of a 10-stone box of Higo-no-kami (approximately): 15 x 16 x 2.8~5.4 cm. Thickness varies. (It actually overflows and bulges.) Total weight including the box is approximately 581g. We’ve eliminated the gacha element, so you’ll receive the stones shown in the photos. ・Please polish and flatten the forging. If it doesn’t sit well, apply a wet cloth or use silicone adhesive on a non-deformable base. Mining is done with heavy machinery, and cutting is done with diamond tombstone cutters. We are not involved with products that falsely claim to be “Iyū Meito” whetstones, as they are imitations. “Iyū Meito” whetstones from around 2007 onwards are made only from coarse whetstones. All names other than the small ones are handwritten to distinguish them. We cannot answer inquiries about “Iyū Meito” stones that have been selected and manufactured by others. ・Siliceous shale from Umegehata, Kyoto City, Ukyo Ward, Yamashiro Province. #6,000~24,000 grit. It requires some skill, but has a higher probability of becoming refined. Due to the continuous circular striations, it’s difficult to achieve a mirror finish with 70% retention and artificial whetstone grit, making it easier to highlight forging lines, material differences, and carbon content variations. ・The harder the stone and the more refined it is, the more rock juice will be produced. Because hardness reduces self-sharpening, perform *komyokura-gake* as needed while sharpening, depending on the purpose and skill level.

【Voltage Compatibility】 When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction.

【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary.

【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device's requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product.

【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer.