Not all squash balls are created equal! The big manufacturers produce a number of different ball types, and the standard is to differentiate the balls with a small colored dots.
two yellow dots
This ball type, sometimes marketed as the “Pro” ball, manufactured by a number of the big brands including Oliver, Karakal, and Dunlop.
Because the double yellow dot ball is a tournament class ball, used in local tournaments and the PSA World tour, alike, it tends to be the most popular ball used at the club level for practices. This may not always be the best selection.
To quote the PSA
>While a 2-dot ball is the de-facto go-to for most club players, choosing a ball above your level, i.e. one you cannot heat correctly, removes a degree of skill from the game, making it is easier to hit winning shots, requiring less fitness, demanding less tactical astuteness and making it harder to play lengthy rallies – all of which are the essence of the sport.1
single yellow dot
The single yellow dot has a slightly longer hang time compared tot the double yellow. (5-10%) This is an ideal ball for players having a difficult time keeping a double yellow “hot”. A single yellow can result in longer rallies.
The red dot ball is an intermediate ball that is ideal for our junior practices. With a 20% greater hang time compared to the double yellow, players are able to focus on technique.
The blue dot ball is usually larger in diameter and has the most hang time. This is the ball of choice for our beginning juniors, who are not able to get a double yellow ball sufficiently hot.