Carbon fiber frog legs are for maximum resistance to heat and wear. They exist in 3 sizes, has great strength, light weight and a self-lubricating needle bearing. · Two-stage ball bearing system ? the ball bearings ensure easy introduction of rope and are less sensitive to the weather, while the second stage is self-lubricating. Geometrically computer-developed frog legs and solid anodization provide maximum wear resistance and optimal grip? even on modern exotic ropes.