This is a Westcott Photo Basics Softbox. Its front diffuser measures 24 x 32" (61 x 81cm). It gathers, intensifies, and softens the light emitted from your flash head or monolight. A Speed Ring Adapter is required, and must be purchased separately. Additionally - the front panel is removable.
Use this size for a two-three person portrait.
Two heat vents keep internal temperature under control