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Brand: PROMEND Product Name: Road bike self-locking pedal Model: PD-R97P black (for SHIMANO SPD system) PD-R97 Black (for SHIMANO SPD system) PD-R97Ti Black (for SHIMANO SPD system) PD-R97P-Ti Black (for SHIMANO SPD system) Material: PD-R97P Engineering plastics body +Chrome Molybdenum Steel Shaft PD-R97 Aluminum alloy body +Chrome Molybdenum Steel Shaft PD-R97Ti Aluminum alloy body +Titanium alloy Shaft PD-R97P-Ti Engineering plastics body + Titanium alloy Shaft Locking plate: SHIMANO 6 degree locking plate, Weight: 298g /pair or 248g / pair or 217g/pair Features: Highway lock pedal can help the driver to increase the cadence speed. If the cadence speed is above the speed without using the lock pedal, there is a danger of the shoes and pedals coming off.So using lock pedals can increase your cadence. In addition, the lock shoes are fixed on the lock pedal, which can correct the riding posture without worrying about the wrong riding posture, causing physical strain.