Matsunaga Rust Eraser is a handy abrasive eraser designed to remove rust, stains, and stubborn buildup from knives and other metal surfaces. It's especially useful for maintaining carbon steel knives, which are more prone to rust.

It's easy to use: gently rub the affected area as you would with a regular eraser. For more effective cleaning, you can dampen it with water.

Available in three grit levels:

• Blue (coarse): for removing heavier rust and stubborn buildup.
• Purple (medium): for general rust and stain removal.
• Green (fine): for gentler cleaning and a finer finish.

The eraser can also be used to remove metal residue from the surface of sharpening stones, but it is not designed for flattening them.

Note: As the eraser contains abrasive particles, it may leave fine scratches or alter the appearance of the blade's finish. Always test it on a less visible area before use.

Specifications (purple):
Dimensions: 60 × 30 × 10 mm (2.36 × 1.18 × 0.39 in)
Grit: #120 (medium)
Material: Synthetic rubber with abrasive particles
Manufacturer: Matsunaga Toishi Co., Ltd.
Country of origin: Japan