The 28 x 28" Westcott Apollo Softbox with Recessed Front and Grid is a softbox based on an umbrella frame fabricated from fiberglass for added durability. It doesn't need a speed ring to attach it to a flash head. Simply open it, and slide the shaft into the umbrella receptor on the flash head or the umbrella swivel supporting your speedlite. The 28" Apollo can be used with a flash, fluorescent sources, or hot lights up to 300 watts.