DescriptionFP9CDouble Chain Drive ModelQuick Adjusting CamAxle Stabilizing Bearing ChamberLow Profile Stabilizing HingeEasy Access Auto Lock Spring AdjustmentWeight Adjustable BeaterIndependent Beater/Footboard Angle AdjustmentBall Bearing Drive ConnectionAnti-Skid Heel SpikesCarrying CaseFP9DDirect Drive ModelQuick Adjusting LinkAxle Stabilizing Bearing ChamberLow Profile Stabilizing HingeEasy Access Auto Lock Spring AdjustmentWeight Adjustable BeaterIndependent Beater/Footboard Angle AdjustmentBall Bearing Drive ConnectionAnti-Skid Heel SpikesCarrying Case