Business Source No. 10 Diagonal Seam Window Envelopes - Single Window - #10 - 4 1/8in Width x 9 1/2in Length - 24 lb - Gummed - Wove - 500 / Box - White

Front window allows use with printed address to prevent reading errors 24 lb. stock produces high-quality look and feel Perfect for businesses, schools, personal use and more Fully gummed flap creates secure closure to prevent peeling during delivery