Quality Park® #10 Window Envelopes can run through a laser printer or inkjet printer. The window film withstands the heat so you can print return addresses or business logos. These 24-lb wove envelopes can be used for professional mailings; side seams provide a more modern, clean look. Each business envelope is 4.13 x 9.5 inches with a moisture seal commercial flap. Stock up on boxes so you don't run out! Seam Type: Diagonal; Flap Type: Bankers; Trade Size: #10; Security Tinted: No.