Common White Business Envelopes
Also available in standard window position and custom window position

#12	4 3/4 X 11
#11	4 1/2 X 10 3/8
#10	4 1/8 X 9 1/2
#9	3 7/8 X 8 7/8
#7 3/4	3 7/8 X 7 1/2
#7	3 3/4 X 6 3/4
#6 3/4	3 5/8 X 6 1/2