made of Acrylic board, ,Flat,one side was Black flannel to prevent reflection
Advantages of acrylic material:Long life, strong impact resistance, light weight.
and Good weather resistance, acid and alkali resistance
So it is stronger than plastic one,lighter and cheaper than metal one,great choice.
Compatible with 4x5 large format camera as Linhof,Technika, Ebony,Toko, Chamonix, Wista etc... .
Thickness:2.2mm