السلم جائز في المكيلات والموزونات والمعدودات التي لا تتفاوت كالجوز والبيض وفي المذروعات
Translation: Salam is permissible in measured, weighed, sufficiently uniform counted goods such as walnuts and eggs, and goods measured by length.
Quduri lists goods measurable by volume, by weight, by count where individual variation is insignificant, and by length or similar fixed measure.
Specified rice, a defined grade of metal, eggs whose individual differences are commercially negligible, and fabric meeting an agreed measurement illustrate these classes. Membership in a general class never eliminates the need for a clear quantity, quality and delivery undertaking.