The Matthews 159021 is a solid frame scrim 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 solid rod. Matthews Solid Frames stainless steel for durability. All Matthews Scrims and Flags are bordered with heavy duty color coded webbing. All 48" x 48" Solid Frames Scrims weigh 4lbs.