This is a Westcott Photo Basics Softbox. It's front diffuser measures 16 x 22" (41 x 56" ). 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 frong panel is removable.
Use this size for a one-person head shot.
Two heat vents keep internal temperature under control