The Red CIRCLE cueball from Aramith/Saluc is made from their carom resin. It bounces better, and people claim to be able to draw better with it.
The Blue CIRCLE cueball from Aramith/Saluc is made from normal pool ball material, and is the cueball for the Brunswick Centennial set of balls.
There are imitation Red Circle cueballs that are not made from carom resin by Saluc, and serve to confuse the general pool playing public.
When Brunswick Centennials were made in the USA, the cueball from that set was the Blue DOT, not CIRCLE.
The Red DOT cueball that's been around for a long time is for the Dynamo bar table. It is a ton heavier than any other 2 1/4" diameter cueball.
The pros have been using the red multi-dot (Polka Dot) cueball from Aramith. The idea was borrowed from the multi-dot cueball that they made for Carom games.You can see the spin on every shot. I like it, but I also like the idea of putting multiple Aramith logos on the cueball instead.
Fred