Quality Park #10 Double Window Security Tint Envelopes are standard business envelopes designed for mailing invoices, billing statements, and financial correspondence. The double window design displays both the sender and recipient addresses through pre-cut glassine windows, eliminating the need to print directly on the envelope. Each box contains 500 envelopes in white wove with a 24 lb paper weight.

The envelopes measure 4-1/8" x 9-1/2" (#10 standard size) and feature a security-tint reflex blue interior pattern that obscures the contents even when held up to light, protecting sensitive client information. The top window measures 1" x 3-1/2" and the bottom window measures 1-1/8" x 4". Closure is via a traditional gummed flap — simply moisten the adhesive strip to seal. Made in the United States by Quality Park Products (model QUA24550).