StudioPRO 60 Inch Octagon Softbox Photography Light Diffuser & Modifier with Bowens Speedring Mount For Monolight Photo Studio Strobe Lighting Available in 4 sizes, 38", 48", 60", 68", and includes One (1) Bowens Speedring Includes (2) Diffuser Panels Fits StudioPRO 300W/s, 400W/s, & 600W/s Monolights Inner diffusion panel can be optional Material: Nylon