Quality Park, #10 Security Window Envelopes, Gummed, White, 500 per box (90130) PROFESSIONAL FINIISH: Bright White paper makes for a fresh, clean appearance GUMMED FLAP: Provides users with ease of mind that their contents will stay securely closed SECURE: Interior blue tint will keep your contents safe from prying eyes, so you can ship fearlessly. GREAT VALUE: Every box comes with 500 gummed envelopes that are so versatile they can be used for multiple purposes. DURABLE: Heavyweight 24-lb. paper stock ensures no rips or tears