An Istisna'a Sukuk represents a fractional share in the project financing of an undertaking to manufacture or construct an asset for a customer at a price to be paid in future instalments, the total of which equals the total face value of the Sukuk, in addition to mark-up. The Sukuk can be in the form of serial notes or certificates with different maturity dates that match the progress schedule of instalments as agreed between the buyer/customer of the asset and the manufacturer/bank. Istisna'a Sukuk are tradable as the subject-matter is considered to be a non-financial asset (work-in-process inventory).