desert1pocket said:I have weighed numerous brand new red circle and blue circle cueballs, and while there were slight variances, the average weights were the same. Unless a ball is very very worn, any weight difference is hard to notice during play. A difference in materials however is very very noticeable.
Because the red circle is more elastic, it is easier to draw, and harder to follow than the blue, giving it the illusion of being lighter. Even a well worn and significantly lighter blue circle will give the illusion of being heavier than a brand new red circle.
If you want to test the elasticity of your cueballs, drop them multiple times from a set height onto a very smooth concrete floor, and see how high the average bounce is for each one. You should see that the red circle will bounce significantly higher than the blue regardless of their weights.
Like I said before there is about 1 to 2 grams difference in weight. While this is not a great deal it will effect the way the ball reacts and how far it will roll.