The 48 x 48" Solid Frame Scrim White Silk from Matthews offers 1/4 stop of light reduction. It is made with two "ears" at the bottom that protect the fabric when frames are slid in and out of their storage boxes and can be used as a point to tie off when used in certain conditions. To keep weight to a minimum and yet get maximum strength, all Matthews Solid Frames are made of 3/8" thin wall tubing. The mounting pin is a solid rod, and the frame is black powder-coated to minimize reflections.