ADVANTUS Sturdi-Kleer Self-Adhesive Polypropylene Envelopes, 4 x 6 Inches, 50/Pack (ANG1444P-50) Pack of 50 self-adhesive multi-use polypropylene envelopes Attach to any dry, clean, flat surface Size is 4 x 6 inches each Thumb cut edges for easy insertion of contents Frosted, see-through