The present invention is directed to resilient golf balls and portions thereof including compositions containing zinc dimethacrylate and zinc pentachlorothiophenol, and methods for making same. In particular, the present invention is directed to a golf ball having at least one of a center, cover, or intermediate layer that includes a reaction product that includes a resilient polymer component, a free radical source, zinc dimethacrylate and at least one halogenated organosulfur compound having the following general formula I: ##STR00001## where R.sub.1-R.sub.5 can be substituted or unsubstituted C.sub.1-C.sub.8 alkyl groups; halogen groups; thiol groups (--SH), carboxylated groups; sulfonated groups; and hydrogen; in any order.