Letter sheets are the formal paper in your stationery collection used for longer letters. There are a few different sizes available.
The size you select is usually a matter of taste, style and preference. However, as they go up in size they become more formal. The note sheets and monarch sheets are generally used for non-business correspondence. One point of reference is the fact that some choose to run their executive stationery through a laser printer for correspondence at work. If you choose to go this direction you will want to make sure that flat ink is an option. Thermograved or "raised" ink tends to melt when ran through laser printers. Thus, smearing the ink on the stationery.
Letter sheets are generally suitable for any correspondence with others. Letter sheets provide an elegant way to correspond in a very simple, tasteful manner. If you prefer bright colors and fun whimsical designs you may want to choose the less formal memo sheets, memo pads, or fold notes that are available. When responding to formal invitations, blank letter sheets are generally used. It is a general rule of thumb to order blank second sheets because the back of the letter sheet is never used.
Letter sheets may be embossed, blind embossed, or printed with your name and address. Letter sheets fold from top to bottom and will fit inside an envelope that is half its size. The envelopes are generally included in your order; however, printing or embossing is usually available on your envelopes for an additional charge.