R.I. Gen. Laws § 6-10-4: Determination of net content.

The net content of any unit of thread shall be determined by ascertaining the average net weight or yardage of not less than ten (10) units of thread of the same type and put-up, selected at random from the units kept for the purpose of sale, sold, exposed, or offered for sale. That average shall not be less by more than three percent (3%) than the weight or yardage marked on the units or the package containing the units.