The Profoto OCF Softbox measures 1 x 4' to provide a long, narrow beam spread that's useful for a hair, accent, or background light. Great for casting long, elegant highlights on reflective objects, it produces lengthy shadow edges from the long side and harder light from the short side with shorter shadow edges. The softbox includes a strip mask and a bag, and an optional fabric grid is available for separate purchase. The OCF Softbox requires a speed ring for use.