WM4 is Grandview's 4-layer fiberglass matte white fabric engineered for portable projection screens, delivering a neutral 1.0 gain image with wide-angle clarity in tabletop and pull-up formats.Reinforced Fiberglass CoreA top-grade fiberglass support layer is sandwiched between anti-static white and black PVC coatings, keeping the surface flat and resistant to heat, moisture, and stretch (under 1% max) even after repeated rolling.ISF-Certified Color AccuracyReflective PVC microdots and a matte finish deliver ISF-certified color accuracy with a wide 160° viewing angle, so image quality holds up from off-center seats.Built for Portable UseEngineered specifically for compact, frequently-moved screens such as U-Work tabletop and Portable Series pull-up models, resisting mildew and wear from regular transport.