Camera Light Seal Form 250 X 125 X 1.0mm(9.84 X 4.92 X 0.03 in) Camera Light Seal Form 250 X 125 X 1.0mm(9.84 X 4.92 X 0.03 in). Camera Light Seal Foam is also called a Light Seal and it is located inside the back cover of camera. It is to prevent from light leaks. Japanese camera manufactures have used this materials for anti-reflection long time. Therefore, this is best anti-reflection materials for cameras and Binoculars. We attached the high quality double-face adhesive tape(made in Japan) on this so, you don't need to use any bonds. Made in Japan