The Innerforce ULC represents the third generation of Butterfly's high tech Uniaxial Light Carbon Blades. This blade features a unique construction process where all the carbon fibers are pointing in the same direction. This allows for thinner Carbon layers that contain the same number of Carbon Fibers. The Innerforce ULC provides all the power and increased sweet-spot of the heavier carbon blades with much more "feel" and ability to produce heavy topspin. Let the Innerforce ULC bring out your own controlled aggression.