This is a polypropylene tape made of acrylic adhesive, stronger and more versatile than most tapes of its type. It is totally transparent and disappears completely on all papers and won’t create shadowy ghosts on photocopies or diazo copies. The long lasting tape is moisture-resistant, won’t curl, crack, or yellow. It’s extra-holding power is ideal for use by blue-printers, architects, and engineers. Use to mend torn vellum sheets.