KitchenIQ Edge Grip 2 Stage Knife Sharpener
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Don’t let the small size of this cutie fool you.
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I am a mechanical engineer.
What many reviewers have mixed with rust around the metal coarse sharpening side is actually an alloy that is used to ‘harden’ the carbide insert that actually makes the grinding process.
This is stated in the product description.
If you look closely, you will find that the bronze color surrounds a rectangular block with carbide sharpening material.
It is placed around the technique called soldering (so the surrounding bronze color always fills a circular arc).