Columbian Envelopes #10 Business envelopes are the perfect all-purpose Envelope for letter-sized business documents. Too busy to wet-sponge your way through stacks of waiting mail? Self-seal Envelopes are affordable self-sealing Envelopes that don't require Moisture. Just peel, Press and go. The Peel able paper strip protects the adhesive from dust so your envelopes last longer in storage. Side-seam Envelopes provide a clean back panel that makes it easier to print logos and other information on back without folds and creases getting in the way. These Columbian Envelopes plain front, no window envelopes are made from classic 24 lb. White wove paper. Ideal for business stationery, invoices, statements, checks, marketing promotions and more. Every household and small business needs a supply of #10 envelopes. Stock up on a never-out essential. #10 envelopes measure 4-1/8 x 9-1/2 inches. 500 per box.