This is a Photek U-Series 60"" (1.5m) Silver Umbrella with a 7mm umbrella shaft. Photek U-Series umbrellas are manufactured on a 10-spoke frame, giving them more stability than an 8-spoke frame used by most other umbrella manufacturers. A white umbrella greatly softens and broadens the light output of any strobe or lower wattage constant light. Silver umbrellas soften, too, but they provide a slightly ""harder"" light, with specular features in the highlight areas. For Heads That Accept Only 7mm Shafts. Set-up is the same as with any standard umbrella..