Pro Tapes Caution Ribbon Tape is Polyethylene and Non Adhesive! Pro Caution Ribbon is a 2 mil polyethylene non-adhesive tape used to limit entry to hazardous or restricted areas. Outdoor rated it's poly printed in black on a hot yellow background. Inexpensive and very practical. Size: 3" x 1000 ft. Used to warn of temporary hazards. Attaches easily to walls, posts, etc.