... made of top grade glass with high transmittance and resistance 20*20cm Circular polarized filters, top grade glass with high transmittance ... %, transmittance >42%, compensation 125nm/138nm2) sizes available: 15 x 15cm, 20 x 20cm, 25 x 25cm, 30 x 30 cm, we ... , Master Image 3d cinemas, family projectors, office projectors, school projectors 20*20cm Circular polarized 3d filters