This rugged, stiff design is made with CarboFlax bio-composite hybrid technology; ultra high modulus carbon and natural flax fibers Offers superior vibration dampening with a thinner profile to decrease wind resistance Comes with four ounces of weight: the patented Kryptos Arc Vibration Dampener The Kryptos Arc works like an accordion to remove Z-axis vibrations that travel into your hand Arc-shaped coils traverse over one another as opposed to smashing into each other for the most efficient vibration reduction .550 diameter