The 8-011-0006 15mm Carbon Fiber Rods (4", Pair) are designed specifically for Redrock Micro's wide variety of support systems. The rods are 15mm in size, making them ideal for attaching a mattebox, follow focus, and much more. The carbon fiber nets a total weight reduction of 66% when compared to stainless steel, making the unit incredibly light. Carbon fiber is not only extremely light, but also has a rigidity that exceeds titanium, making it extremely sturdy.