Official Certified Mail Form CEL-43-R (With Electronic Return Receipt) 3 Up per sheet, 300 forms total per package CEL-43 are sold in packages of 100 sheets = 300 Mailings Legal size (8/5″ X 14″) – usable with all laser printers PS Form 3800 Official Certified Mail Form CEL-43-R, 3 Up per sheet, 300 forms total per package CEL-43 are sold in packages of 100 sheets = 300 Mailings Legal size (8/5″ X 14″) – usable with all laser printers Forms may be separated and printed one at a time through an envelope feeder or printed by the sheet through a legal-size tray CEL-43R CEL43. With Electronic Return Receipt