The #10 Envelopes are white letter-size mailing envelopes with dimensions of 4-1/8x9-1/2 inches. This pack includes 500 envelopes made of paper material, suitable for business occasions. The Quality Park brand ensures reliable performance and the gummed closure type provides a secure seal for your mailed documents. The rectangular shape and white color make these envelopes a versatile choice for various shipping needs.