6 x 9 White Booklet Envelopes (Flap on the 9” Side)Booklet or Open Side Style is Perfect for Easy Loading of Documents, Greeting Cards, invitations, Pictures, Letters and other Home, School, or Office MailersValue Box of 500 Envelopes with Strong Gum FlapThese Side Loading Envelopes are Made of Heavy Durable 24lb. White Paper to Handle all Contents.Made in the USA