Material: made of PMMA acrylic. | Compatibility: Fit for 4x5 large format camera for example Wista, Horseman, Toyo, Sinar, Shen Hao, Tachihara, Linhof, Grid making for 6x6, 6x7, 6x9, 6x12, 9x12. | Feature: ground glass and fresnel screen made in one piece, 2~3 stops brighter than general ground glass. more clear, focusing easy, high contrast, integrated screen. | Package include: 1x 2 in 1 screen (ground glass + fresnel screen) + 1x protective tempered glass ( not include film which show in the picture) | Installation: the Matt surface towards the lens, the glossy surface towards yourself, then put the protective screen behind the focusing screen.