9x12 Booklet Envelopes-Open Side envelopes-White Booklet 28 LB Envelopes-Catalog Envelopes-100/Count (9x12) 9x12 White booklet envelope features a gummed closure Great for mailing out sales brochures, annual reports, and product literature Envelope open on the side These are standard 28Lb Envelope Check O Matic 100% Satisfaction Guaranteed. Comes 100 in a box