Interfit STR213 Strobies Pro Flash Silver Black Umbrella Description. The 100cm 39 Strobies Pro-Flash Silver Black Umbrella is used to bounce light onto your subject. Silver umbrellas provide slight softening of skin tones with increased contrast & sharper edges than white umbrellas. The black backing limits the amount of stray light polluting your scene. The highly reflective silver surface limits the light loss to less than 1 stop. All Pro-Flash umbrellas feature a double-folding design & telescopic shaft for compact storage & transportation. The umbrella fabric is made from high quality nylon while the umbrella frame & shaft are made from light weight high quality aluminum. The Strobies Pro-Flash Reflector Holder for Umbrella not included is required to mount umbrellas to the Pro-Flash unit.