Product description easily maximize your distance from the fairway the rough and even the tee with bi o cell my fly8 technology forged bi o cell and e9 face technology new bi o cells combined with e9 face technology removes more weight from the face and crown to reposition it low and back to deliver the best combination of a super low cg and high moi high strength face insert forged thin shallow high strength steel face inserts driver like construction enables more face flex for faster ba