Quality Park No. 10 Single Window Security Tinted Business Envelopes with a Self-Seal Closure - Single Window - #10 - 4 1/8" Width x 9 1/2" Length - 24 lb - Self-sealing - White - Wove - 500 / Box

No. 10 Single Window Self Seal Envelopes provide dependable performance, strength, durability and privacy. Redi-Seal closure requires no moisture, extends shelf life and produces a secure seal. Double-flap design keeps the gum from sticking before use. Security tint protects the contents even when held up to light. Window conveniently accommodates a printed address, eliminating handwritten addressing. 24 lb. bright-white stock gives mailings a professional look.