Quality Park Security Window Envelopes - Single Window- 4 1by8 W x 9 1by2 L- 24 lb - Gummed - Wove - White Description: Security business envelopes feature a blue inside tint to protect your privacy. Redi-Strip on the flap provides a clean quick seal immediately upon contact. Simply peel off the adhesive strip and press to seal. The peel-off strip protects the adhesive from dust for a longer shelf life. No. 10 envelopes include a high-quality poly window for your mailing address white wove 24 lb. stock and a contemporary seam. Features: Product Dimensions: 4 1/8 W x 9 1/2 L Weight: 24 lbs Gummed. Wove Color: White Country of origin: China Brand Name: Quality Park Model No: 2088-QUA90130