StudioPRO 20in x 28in Rectangle Softbox with Universal Speedring for Portrait or Product Photography Studio Flash Lighting - Fits Fluidly with StudioPRO Monolight SP-100, SP-160 and SP-180 One (1) Rectangle Softbox and One (1) Universal Speedring Two (2) Diffuser Panels 20" x 28" Fits StudioPRO 100W/s, 160W/s, & 180W/s monolights Best Photo Uses: portraitures, product photography, fashion, and more!