What is this close-up picture? (WotsThat: Steel wool fibres)

Question

What object is shown in this zoomed-in close-up photo?

SlagRunner · Accepted Answer

Steel wool fibres. Steel wool is made by shredding steel into ultra-fine fibers, creating a material so abrasive it can strip paint and rust but delicate enough to use on non-stick cookware. It's been a household staple since the early 1900s and remains one of the most versatile cleaning tools ever invented.

Answer: Steel wool fibres

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