An 8-ball set contains balls 1–15 plus a cue ball; solids and stripes are assigned during a standard rack. A 9-ball set contains balls 1–9 and a cue ball for a game where the lowest-numbered ball must be contacted first.
Buying checks
Match diameter and weight to your discipline, then inspect consistent polish and clear numbers. Avoid mixing sets with different resin formulas: density and finish affect rebound and cloth wear. For home play, a uniform matched set matters more than decorative artwork.
Which format fits
8-ball is the versatile choice for clubs and family tables. 9-ball suits dedicated practice and a smaller storage tray. Confirm whether the cue ball is included and whether the ball size matches your pocket geometry before ordering.