The Interfit Photographic INT397 is a 43" Translucent/Black/Silver 7mm Shaft Backing Umbrella. Silver umbrella is used to bounce light onto a subject. It provides softening, with a harder shadow than a regular white umbrella. Light loss is usually ~1.5 f/stop compared to the same light used direct, bare light. The black backing cuts down on stray light. Use this size umbrella for a 2 - 3 person 3/4 length portrait.