Aerotech SteelFiber i70 Parallel tip Iron Shafts The lightest SteelFiber shaft in our lineup is a great shaft for those slower swing speed players looking to gain as much yardage as possible. This shaft is offered in a wide range of flexes and can hold up to even the most demanding swings. You won? find a more stable 75 gram iron shaft anywhere. If a player is looking for all of the swing speed they can get or they?e looking to play the golf club substantially over length and want to maintain a reasonable swing weight the i70 is the right choice. High modulus graphite core Over 59 miles of steel fiber covers the entire surface of each shaft Each steel fiber has a diameter of 8 microns or approximately 110th the diameter of a human hair. ShaftFlexLengthWeightTorqueTip ODButt ODParallel TipBend PointSteelFiber i70S4174g2.8.370.6005.5Mid-LowSteelFiber i70R4174g2.9.370.6005.5Mid-Low Products Code:ART0006 Products Name:Aer.