Mitsubishi Chemical Diamana RB Wood Shaft Model Flex:63 R Incorporating M40X into the new DEVOTIONHB6505 Incorporating M40X into the new shafts designs provides significantly improved lateral stability to the shafts during the golf swing 000 MOI (in the 9 Diamana™ RB (Red Board) – the third profile in the most recent generation – is designed with all the traditional branding that made Diamana so beloved – including a return to the original 53 63 73 83 weight class designations – and all the engineering prowess and material innovation that made the brand dominant on tour Diamana RB is a classic "Red Board” profile — not available since the 2nd Generation of Diamana — that features an active tip section while still retaining the same material technology package and low torque control characteristics as its lower launching counterparts