Ideal for large size conference or training rooms. Permanently lubricated steel ball bearings combined with nylon bushings and heavy-duty spring assembly offers smooth operation even in demanding applications. Optional floating mounting brackets allow the Model C to be mounted onto wall or ceiling studs and aligned left or right after installation by releasing two sets of screws. Matte White fabric up to and including 10" high will be seamless. High Contrast Matte White: Designed for moderate output DLP and LCD projectors. This screen surface is a great choice when video images are the main source of information being projected and where ambient light is moderately controlled. With its specially designed gray base material and reflective top surface, this screen material is able to provide very good black levels without sacrificing the white level output. Flame retardant and mildew resistant. Viewing Angle: 50° Gain: 1.