This part is made for 4 inch lcd of mini projector, it has thermal-isolation and polarization function, with this glass, temperature on LCD decrease 10-20 degree centigrade, which can protect lcd from high temperature damage.One side with polarizerThe side with polarizer face to LED. Try another side if screen show yellow.Size: 96x60x1mm Suitable for 4 inch LCD screen.using:When using, please tear off the front and back protective film and insert it into the slot of the card. There are pros and cons of this film. If the film is installed upside down, please check by yourself. We suggest our customer to buy 2pcs for back up, the thermal-isolation glass in mini projector easy burn which might cause LED damage because of high temperature.Note:1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.