Quality Park Reveal-N-Seal Security Tinted #10 Window Envelope, 4 1/8" x 9 1/2", White Wove, 500/Box Pelican The reflective surfaces change color

The reflective surfaces change color in the light as children manipulate the balls

Each card captures up to two in/out cycles per day for seven days

vibration protection technology

acid-free paper resists yellowing and fading

Quality Park Reveal-N-Seal Security Tinted #10 Window Envelope, 4 1/8" x 9 1/2", White Wove, 500/Box Pelican The reflective surfaces change colorKeep confidential information away from prying eyes with these instant seal security envelopes. Each one is manufactured with premium 24 pound wove paper, making it ideal for everyday business and personal use, while the bright white coloring delivers a clean, professional look. These Quality Park Reveal N Seal single window envelopes feature a self seal closure that eliminates the need to moisten the flap or use a pull off strip. Brand Name: Quality