CFR › Title 7 › Part 51 › §51.34117 CFR §51.3411Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link“Usable Piece” means that portion of the potato remaining after trimming, or as it occurs in the sample:(a)Not have any unusable material;(b)Unless otherwise specified, weigh at least 4 ounces; and,(c)Must have at least 50% of peel remaining after trimming.