Slightly rough texture
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
Slightly rough texture means that the skin may be slightly thick but not excessively thick, materially ridged or grooved. “Slightly thick” means that the skin thickness does not average more than 5/8 inch (15.9 mm), on a central cross section, on a grapefruit 4 1/8 inches (104.8 mm) in diameter.
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