Speedplay X1 Titanium Pedals
The engagement mechanism is housed in the cleat, not the pedal. This lets you have a double sided pedal but only carry one mechanism (rather than one on each side of the pedal).
The Speedplay X Series' innovative design and unrestricted float changed the shape of clipless pedals and continues to prove that user-friendliness, comfort, and improved performance are all attainable in a simple, lightweight package. The unique shape of X pedals provides knee-saving lateral rotation, without the self-centering action inherent in most pedals - your knees don't have to work against spring tension. The compact, low-profile shape of X pedals positions your foot closer to the spindle for optimal power transmission and unmatched cornering clearance.