High modulus carbon fiber for the ultimate strength-to-weight ratio Special 100% Aramid weave on top layer ensures long lasting durability, optimum abrasion, and impact resistance Profiled bottom zone for maximum energy transfer Core of the anti-vibration SWD RM19 made of filament fiberglass and polyurethane foam, covered with 45 degree tri-axial woven carbon fibers to maximize its mechanical properties while keeping the weight to a minimum Addition of two unidirectional carbon fibers to optimize flex rigidity and durability Outside surface made of 45 degree tri-axial woven carbon fibers to increase torsion rigidity Two shaft dimesnions available: Red shaft - regular size - 0.785" x 1.18" Blue Shaft - small size - 0.745" x 1.14"