✔️Self adhesive. Pressure sensitive backing attaches securely to almost anything – paper, wood, plastic or metal. ✔️Protects documents inside. ✔️Secure documents such as packing slip, invoice, labels etc. ✔️Great for storing the packing list right on the outside of the box Self adhesive. Pressure sensitive backing attaches securely to almost anything – paper, wood, plastic or metal. Protects documents inside. Secure documents such as packing slip, invoie, labels etc. to carton and other kinds of surfaces.