What is this close-up picture? (WotsThat: Shower head texture (macro))

Question

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

Wolftrax · Accepted Answer

Shower head texture (macro). Low-flow shower heads can use less than half the water of older designs while still feeling powerful, mainly by mixing air into the water stream or narrowing the jets to increase spray pressure.

Answer: Shower head texture (macro)

More man made close-ups