Polystyrene (PS)Diffuser Sheet 1.1mm (Total Thickness with Single Side Protection Film) New Material Polystyrene Only (2440*1220*1.1) Light transparency should be 75 percent. Polystyrene (PS)LGP Sheet 2.85mm (Total Thickness with Double Side Protection) Film) New Material Polystyrene only (2440*1220*2.85)