#10 Business Envelopes (9 1/2" x 4 1/8") #9 Size Envelope A2 Envelopes (5 11/16" x 4 3/8") A6 Envelopes (6 1/2" x 4 3/4") #A7 Envelopes (7 1/4" x 5 1/4") 6 x 9 Envelopes 9 x 12 Envelopes 10 x 13 Envelopes