a weight of no greater than 1 62 ounces for play outside of usga competition the golf balls can have smaller diameters and be heavier a wide variety of thermoplastic or thermosetting materials can be employed in forming the center core layer s intermediate layer s and or cover layer s these materials include for example grafted polyolefins such as fusabond u00ae 525d or olefin based copolymer ionomer resins for example surlyn u00ae ionomer resins and dupont u00ae hpf 1000 and hpf 2000 as well as blends of surlyn u00ae 7940 surlyn u00ae 8940 or surlyn u00ae 8150 surlyn u00ae 9150 all commercially available from e i du pont de nemours and company iotek u00ae ionomers commercially available from exxonmobil chemical company amplify u00ae io ionomers of ethylene acrylic acid copolymers commercially available from the dow chemical company and clarix u00ae ionomer resins commercially available from a schulman inc polyurethanes polyureas copolymers and hybrids of polyurethane and polyurea polyethylene including for example low density polyethylene linear low density polyethylene and high density polyethylene polypropylene rubber toughened olefin polymers acid polymers for example poly meth acrylic acid which do not become part of an ionomeric copolymer plastomers flexomers styrene butadiene styrene block copolymers styrene ethylene butylene styrene block copolymers dynamically vulcanized elastomers copolymers of ethylene and vinyl acetates copolymers of ethylene and methyl acrylates polyvinyl chloride resins polyamides poly amide ester elastomers and graft copolymers of ionomer and polyamide including for example pebax u00ae thermoplastic polyether block amides commercially available from arkema inc cross linked trans polyisoprene and blends thereof polyester based thermoplastic elastomers such as.