Quality Park # 9 Security Window Envelopes, Gummed, White, 500 per Box, (21212) GUMMED: Fully gummed flaps provide a secure seal to keep contents secured PROFESSIONAL: Contemporary side seam looks modern and professional IDEAL: Ideal for statements and invoices DURABLE: Made from premium 24 lb. stock white wove paper that is ideal for everyday business use GREAT VALUE: Conveniently packed in 500 count to reduce the frequency of repurchasing