Quality Park #10 Recycled Window Envelopes, Gummed, White, 4.125 x 9.5, 500 per Box, (QUA54301) DURABLE: Made from 50 lb. brown kraft VERSATILE: These 4.125 x 9.5 envelopes are perfect for mailing and storing any important documents EASE: Open-end construction allows for easy insertion of documents and printing GUMMED: Fully gummed flaps provide a secure seal to keep contents secured GREAT VALUE: Conveniently packed in 500 count to reduce the frequency of repurchasing