The Kodak 89B Opaque Infrared (IR) Optical Filter blocks all UV and visible radiation. Blocks up to 800nm (approx).Most Kodak gelatin filters are available in 3 x 3 (75 x 75mm) 4 x 4 (100 x 100mm) 6 x 6 (150 x 150mm) and 14 x 18 (350 x 450mm).