Support

Customer Support

About KOKU Membership

By joining KOKU membership, you can enjoy the following benefits:

Membership Card Issuance

Expert advice on knife-related questions

Discounts on sharpening and engraving

2nd floor cafe discount

Various class discounts

Member community participation

After-Sales Service

Sharpening Prices

Member Price

General Price

70-150mm

755～990円

770～990円

165-180mm

1,000円

1,100円

200-210mm

1,000円

1,210円

240mm+

1,100円～

1,320円～

Special Shape

Consultation Required

Chip Damage Repair Prices

Member Price

General Price

1mm chip damage

Included in basic fee

3mm or less chip damage

＋330円（税込）〜

More than 3mm chip damage

＋550円（税込）〜

Sharpening & Maintenance

Sharpening Method

1

Soak the whetstone in water until no bubbles appear (about 5 minutes)

2

Face the knife blade toward yourself, position at 45 degrees to the centerline of the whetstone.

3

Maintain the knife angle at 10-15° to the whetstone surface.

4

To prevent blade rounding, apply pressure when pushing and reduce pressure when pulling.

5

Sharpen until a burr appears on the blade edge.

6

When sharpening the back, position symmetrically to the front and repeat the same process.

Maintenance

1

Soak the whetstone in water until no bubbles appear (about 5 minutes)

2

Face the knife blade toward yourself, position at 45 degrees to the centerline of the whetstone.

3

Maintain the knife angle at 10-15° to the whetstone surface.

4

To prevent blade rounding, apply pressure when pushing and reduce pressure when pulling.

5

Sharpen until a burr appears on the blade edge.

6

When sharpening the back, position symmetrically to the front and repeat the same process.

Customization Options

Your preferred handle and knife sharpness can be customized as your unique original knife, one of a kind in the world. Various customization options are available here.

Description of various customization options goes here. *Please contact KOKU for details.