This is a Westcott Photo Basics Stripbox. Its front diffuser measures 17 x 50" (43 x 127cm). 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 hair or edge-light.
Two heat vents keep internal temperature under control
Inner baffle adds diffusion.