Eliminate the harsh, headache-inducing glare and flicker from typical fluorescent lighting with these light filters! These fabric panels fit over standard ceiling fixtures with sturdy, sewn-in magnets. Four 4'W x 2'H heat-resistant panels. For use with fluorescent lights only. Certificate of Conformance for flame retardancy. Size: 20.3 x 20.3 x 5.1 cm.