... circle shape 1.circular polarized projecting lens, 3D filters2.for 3D movie projector3.for 3D theater4.avaliable for squar and circle shape5.size: 150mm ... : 15 x 15cm, 20 x 20cm, 25 x 25cm, 30 x 30 cm, we also do custom sizes according to customers' requirementsUseage ... cinemas, family projectors, office projectors, school projectors circular polarized projectiong lens for 3D movie projector