Stereo viewer type box (slides inward and outward to zoom). 1 sight glass background frosted glass slides plus 11 overlooking Lourdes, France. Views include pilgrims, processions, architecture and statues of Lourdes. Viewer dimensions: 118 x 93 x 50 mm Dimensions of the glass slides: 107 x 45 mm. Made Simple cardboard covered with black canvas. Simply move the inner box to focus. This viewer lets you view stereoscopic images on glass plates in the format of 45x107 mm. Measures Viewer / Glass 4,5x10