Fotodiox Pro 36" Octagon Softbox PLUS Grid (Eggcrate) for Studio Strobe/Flash with Soft Diffuser and Dedicated Speedring, for Calumet Genesis 200, 400, 300B Strobe Flash Light, Soft box, Speed Ring Pro Grade, Heat Resistant Premium Grade Materials w/ Heavy Duty Construction Features Inner Baffle and Outer Diffusive Cover for Even Light Throw Sealable Venting for use with Continuous Lighting, Rotating Speeding with Thumb Screw Lock Lightweight eggcrate design grid, 50 degree angle, produce controled light source Each grid is 2"x2" and 1.5" deep, Each size adjustable by collapsing cells