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