US Patent 9498685 Putter face insert

A putter-type golf club head having a face insert composed of at least one thermoplastic polyether ester elastomer is disclosed herein. The face insert includes a plurality of oval-shaped holes having a specific size and spacing, and the at least one thermoplastic polyether ester elastomer incorporates polytetramethylene ether soft segments with molecular weights of greater than 1000 g/mol, preferably at least 1400 g/mol.