3M™ Polyester Film Tape 850, Transparent, 4 in x 216 yd, 1.9 mil, 12 Roll/Case. For splicing applications requiring quick stick and an aggressive, permanent hold, use 3M™ Polyester Tape 850. Used in a variety of applications, including web processing, label protection, and marking. This tape is available in various colors, as well as a transparent.