7 CFR § 51.1404 - Size classification.

Size of pecans may be specified in connection with the grade in accordance with one of the following classifications. To meet the requirements for any one of the classifications in Table 1 to this section, the lot must conform to both the specified number of nuts per pound and the weight of the 10 smallest nuts per 100-nut sample.

Table 1 to § 51.1404

Size classification	Number of nuts per pound	Minimum weight of the 10 smallest nuts per 100-nut sample
Jumbo Extra Large Large	55 or less 56 to 63 64 to 77	In each classification, the 10 smallest nuts per 100 must weigh at least 7% of the total weight of the 100-nut sample.
Medium	78 to 100
Small	101 or more