Quality Park #10 Double Window Redi-Seal Security-Tinted Envelopes are professional business envelopes designed for mailing invoices, statements, contracts, and other confidential documents. Each envelope measures 4-1/8" x 9-1/2" and is made from bright white 24 lb. wove paper for durability.

These envelopes feature a dual-window design — a 1" x 3-1/2" top window for the return address and a 1-1/8" x 4" bottom window for the mailing address, both positioned on the left side. A security-tinted interior pattern helps protect sensitive information from being read through the envelope even when held up to light.

The Redi-Seal wallet flap closure seals securely without moistening, making it ideal for high-volume mailing tasks. The flap opens on the long side for easier insertion of documents. Made in the USA. Sold in a box of 500 envelopes.