No. 10 window envelopes are made with post-consumer recycled fiber and feature a single window on the bottom left side to save time and money. You won't have to address the envelope separately. Perfectly positioned window accommodates an address for a business mailing. Window measures 4-1/2" x 1-1/8" and is positioned 7/8" from the left edge and 1/2" from the bottom. Bright-white stock gives mailings a professional look. Contemporary side seam on the 24 lb. White Wove envelope looks modern and professional and is ideal envelope choice for inserting during bulk mailing applications. Flaps are fully gummed for a secure, permanent seal.