The Columbian #10 Single-Window Security Envelopes are a reliable and secure option for businesses and individuals needing to send confidential documents. With a size of 4-1/8 x 9-1/2 inches and a white color, these envelopes provide a sleek and professional appearance. The 250 count package ensures that you have an ample supply for your shipping needs, while the manufacturer’s reputation for quality ensures that these envelopes will protect your documents effectively. A16