3 Part Carbonless or NCR forms are used for multi-leaf business forms to avoid the inconvenience of using carbon paper. A "set" typically consists of a white top sheet plus a number of tinted under-sheets (as per your requirements). These NCR sets can be sequentially numbered if desired. These sets are available as "loose" sets, or in the form of "pads", where 50 or 100 sets are glued to form a convenient pad. Examples of typical usage are: invoices, credit notes, receipts, business forms, and other occasions where one or more copies of a document are required.