Up until the introduction of a special solid core model in the late 1960s, golf balls usually had a rubber center filled with a liquid. Many of those golf balls contained honey. Honey can keep indefinitely and had all the physical traits necessary to make a great liquid-filled golf ball. Today, most balls have a solid core and the mass-produced liquid-center balls use synthetic materials. However, one can occasionally find an older ball that still has honey in the middle.
