What is Chroma Key Backdrop Collapsible Green Projector Screen

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Green screen are using for OVERWATCH game streaming,photography background,3D making etc.
Here are the specifications about the green screen:
1.The green screen fabric is polyester canvas,totally light proof. color number: Green PMS354C
2.The frame and case is all aluminium.
3.Structure is with pneumatic control, auto lock function, easy to adjust the height, easy to lift up and collapse in the case.
Standard size is 1.48m(W)*1.8m(H) and 2.14m(W)*1.8m(H).
Application:Photo backgrounds, Display banners, Decorations