These cardboard linear polarized 3D glasses feature specially cut 45-degree opposing polarized lenses for clear, comfortable stereo viewing. Designed for use with compatible projectors using left and right polarizing filters (not including Fed projectors), they come in a convenient pack of 10 for classrooms, events, or group screenings.  Work on TDC, Realist, ViewMaster Stereomatic, and Compco Triad 3D Projectors.  Also works with our linear polarized filter squares for dual projector set ups.