Quality Park #10 Laser/Inkjet Window Envelopes, Gummed, White Wove, 4.125 x 9.5, 500 per Box, (21384) GUMMED: Fully gummed flaps provide a secure seal to keep contents secured PRINTER COMPATIBLE: These envelopes are laser and inkjet printer compatible ADHESIVE: Adhesive and window film are designed to stand up under the heat of the printers FEATURES: 500 White Wove, 4.125 x 9.5 #10 Laser/Inkjet Window Envelopes GREAT VALUE: Conveniently packed in 500 count to reduce the frequency of repurchasing