Joint pins come in a variety of shapes and sizes, and more are coming out with every new cue maker. The first number indicates the diameter of the screw and the second number indicates the number of threads in one inch. See example on the right. Wood to wood connections refer the cue coming together where the wood of the shaft meets the wood of the butt, likewise, a metal to metal connection has metallic connection. Neither of these affect the way the cue plays, however, each one will have a distinct feel as well as balance.
Balance is also a personal preference.
As mentioned above, the type of material in the joint will affect the balance of the cue. A metal joint will balance your cue closer to the middle of the cue. A wood connection will have a rear balance. Cues that are rear weighted are often referred to as butt heavy. The weight of the cue is one of the most important factors of a cue.