Quality Park #9 Business Envelopes, Gummed, White, 3.875x8.875, 500 per box (90090) SECURE: redi-strip selfadhesive closure will ensure your contents stay safe with the licking factor out of mind MULTI-PURPOSE: Use this for photos, important documents, CDs, books, certificates, etc. PROFESSIONAL FINISH: Bright white 24lb wove paper makes for a fresh, clean appearance perfect for any use. STANDARD #9 BUSINESS ENVELOPES: 3 7/8 x 8 8 7/8, Ideal to fit in #10 envelopes for return mailing, easily fit standard documents. GREAT VALUE: Every box comes with 500 gummed envelopes that are so versatile they can be used for multiple purposes.