The Interfit STR213 Strobies Pro-Flash Umbrella (Silver/Black) is a 39" (99cm) umbrella constructed of nylon fabric with a metal shaft and frame. It can be used to bounce light from your flash onto the scene for a soft, diffuse effect. Silver umbrellas provide a softening of skin tones while simultaneously increasing contrast and creating sharper edges than white umbrellas. The black backing helps by reducing the amount of stray light that hits your scene. Also, the umbrella limits light loss to just one stop. The Pro-Flash umbrella feature a double-folding design and telescopic shaft that allows you to more easily store and transport it. It extends from 15.3" to 25.5" and has a shaft diameter of 8mm (0.31").