JAM Paper & Envelope Brite Hue Blue #10 Window Envelopes measure 4 1/8 x 9 1/2 inches and are made out of smooth 30% recycled 80lb paper. Each of these envelopes features a clear plastic fully transparent window on the bottom left to show case the addresses printed on the letters and notices placed inside. These envelopes feature a vibrant eye-catching bright blue color that causes them to stand out anywhere! This pack contains a total of 50 envelopes. Their size makes them ideal for three-times-folded standard sized sheets of paper. Use them to send business letters and other maligns from your office with a burst electric blue! 4 1/8 in 9 1/2in | Color: Brite Hue Blue | Quantity: 50