These are semitransparent sheets and are of following types: Tracing Sheet available in 90/95gsm, 110/115gsm and 150gsm. It is used by artist and printers to develop tracings for screen printing.
Laser Protection Film
LPF film is of 100 microns and is available in A/4, A/3 and 12×18 Size.
Laser ID Sheets
They are available in A/4 size and are used for making ID cards for corporates and schools.
Over Head Protection Film
It is used in OHP projector as well as in spiral binding available in 100 and 175 micron.