Projection system:orthographic projection Appearance sharps: octagon (use the 0.6mm Cold-Strip Steel material) Material of screen surface: matte white, grey matte white (can customize with the glass beaded and grey glass beaded) The material of the crust use the aluminium alloy, pneumatic scissor support structure, to start contraction of lightweight comfortable, arbitrary position, lightweight and portable storage, modeling of modern fashion, the ideal choice for business office and home. Note: Size can be processing upon request