Dual Action Rotating Bicycle Seat - The Cure for discomfort & Pain Pressure free bicycle seat; swivels on vertical axle left and right + up and down on horizontal axle Since there is no horn, no pressure in groin ideal for Prostate issues and other medical conditions. Since seat rotates Arthritis, Fibromialgiy and Hemorroids patients have found this beneficial Seat pads filled with medical gel; ideal for both moving and stationary bikes Fits on Straight Stem Seat Post with 7/8" diameter on top