A contract whereby the purchaser (al-mustasni') asks the seller (al-sani') to manufacture a specifically defined product (al-masnoo') using the seller's raw materials at a given price. The contractual agreement of Istisna'a has a characteristic similar to that of Salam in that it provides for the sale of a product not available at the time of sale. It also has a characteristic similar to the ordinary sale in that the price may be paid on credit; however, unlike Salam, the price in the Istisna'a contract is not paid when the deal is concluded. A third characteristic of the contractual agreement of Istisna'a is similar to Ijarah (employment) in that labour is required in both.