Inovai 30 center shaftthe inovai 30 center shaft is bettinardis latest innovational masterpiece this unique design is made up of both aluminum and stainless steel the aluminum is utilized in the face to create our softest feeling putter yet and the stainless steel back weight creates the density needed for perfect head weight this slight toe hang moi mallet has extreme perimeter weighting which promotes a stable stroke and larger sweet spotputter materialsoft carbon steelall of our product