Mitsubishi Chemical Diamana prototype putter shaft (approx. 105 grams)

“The collaboration between Morikawa, Sweeney and Mitsubishi resulted in a Diamana prototype putter shaft that’s a “different makeup” and roughly 20 grams lighter — Morikawa’s new shaft is about 105 grams — than the model he used this season, in an effort to reduce the extreme weight difference between the shaft and head.”