Ricoh - Optional Duplex Unit for G500 402275 PAPER SIZES - 8.5" x 11", 5.5" x 8.5", A4, B5 (Standard with the G700; Duplex is not available when paper is fed from Bypass Unit). PAPER WEIGHT - 16 ~ 28 lb. bond (60 ~ 105 g/m2) BYPASS TRAY - Paper Size: 8.5" x 11", 8.5" x 14", 5.5" x 8.5", A5, A4, B5: *Envelope : C5, C6, DL, COM10, Monarch *Paper Weight: 16 ~ 43 lb. bond (60 ~ 163 g/m2) *Capacity : 1 sheet (Bypass tray is part of the duplex unit; If the bypass tray is required for the G500, the duplex unit must be purchased).