Business Source Self Adhesive Kraft Catalog Envelopes - Catalog - 9" Width x 12" Length - 28 lb - Self-sealing - Kraft - 250 / Box - Brown Kraft - Catalog envelopes feature an adhesive strip protected by a removable paper liner. Simply remove the liner and press the flap closed for a quick, clean seal upon contact without moistening. Paper liner keeps adhesive free of dust. Envelopes are made of Kraft material. 28 lb.