This umbrella has a unique design structurally as well. The shaft is double walled for strength, but it tapers to 7mm to fit Elinchrom and other European flash heads. Insert the shaft into the tilter bracket below the Elinchrom head. The 16 inner ribs are made of durable fiberglass and the fixed black backing ensures that all of the light output is on your subject instead of through the umbrella. The silver interior is slightly cooler in color temperature than a white umbrella and tends to focus the light into a soft but narrower field. You can also vary the light-to-umbrella distance along the shaft for a harder or softer light. This silver version is ideal for throwing the light over a long distance. Two of them, for instance could light an entire auditorium or a large graduating class.