Sassy Swirls Silver Shimmer Self Sealing Cellophane Envelopes 4.375 x 5.75 inches. 10 or 100 cellophane envelopes sold per package. Self-sealing (self-adhesive) makes your catalog mailings so quick, easy and professional. Think of these bags as decorative envelopes with a self-adhesive strip to seal them. Bag background is clear.