Regular EnvelopesNo.: CMXEP-005Regular Envelopes are the standard of business envelopes. This product range includes the popular #10 envelope which measures 4 1/8" by 9 1/2". All regular envelopes feature a solid front with no window, and a basic flap on the back. Some Regular Envelopes have special features, including security tint to conceal the contents and pre-moistened adhesive flaps for easy closure. Businesses use these envelopes to send invoices, checks, letters, and other types of mailings