Mitsubishi Chemical Diamana RB Wood Shaft Model Flex:63 R Tip stiffness and torque are shirt Tip stiffness and torque are further controlled through the use of 40 ton carbon fiber in the shaft's construction This compact mallet offers a fresh look with widened shoulders that distribute weight evenly toward the perimeter of the putter Diamana™ RB was engineered to promote ease of launch while also maintaining control down field 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