9 x 12 Self Sealing Envelopes White , Redi-Seal Envelopes 28lb,Box of 100 Catalog ,Open End Envelopes Heavyweight catalog envelope with a 28-lb. paper stock features a Redi-Strip(TM) self-adhesive closure Quick seal immediately upon contact Paper strip keeps adhesive free of dust Removable strip provides contact closure without the use of moisture 100 box