Add to the end of most modern day stabilizers, side bars, or v-bars to reduce vibration in all axes…X, Y, and Z Equally spaced ribs around the circumference for superior Z-axis vibration dampening ARC-shaped aerodynamic, scalloped ring grooves designed with smallest diameter ring grooves in the middle for superior X and Y-axis vibration dampening Tested and found to have superior vibration dampening and wind resistance qualities vs rubber dampers with bulging ball shapes Made of our proprietary rubber for less stabilizer tip sag when weights are added Both ends are female 5/16”-24 threads Weighs 1oz Made in USA