9 X 12 Catalog Envelope - PEEL & SEEL174; - 28# White - Open End (9 x 12) - Jumbo Envelope Series (Box of 500) A Quantity of 500 - 9 X 12 Catalog Envelope - PEEL & SEEL&#174; flap. 24# White Wove Paper - Self Seal PEEL & SEEL&#174; Flap Great for mailing catalogs, booklets, magazines, brochures, letters, contracts, certificates, and more. This envelope may be sourced from any one of a number of top brands. Ships via UPS Ground