CFR /  Title 7  /  Part 51  /  Sec. 51.3411 Usable piece.

``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.