203-644-1270/1271
Use business envelopes for everyday correspondence. Use envelopes with matching business letterhead and design paper. Most used sizes are No. 9 (3 7/8 in x 8 7/8 in) or 98 mm x 225 mm; No. 10 (4 1/8 in x 9 1/2 in) or 105 mm x 241 mm.