A portion or piece taken as a representative of a whole. When cost permits, sellers often provide samples to new customers, or of new products to existing customers. Either way, this is normally done at low or no charge to the client. In international trade, sample shipments may present problems as countries´ rules differ in how they are treated for customs purposes. The safest procedure is to ask the buyer whether a commercial invoice is required and, if so, what verbiage should be used. For many countries, a “no charge” invoice stating the lowest defensible value and clearly indicating the phrase “samples – no commercial value – not for resale” will be enough.