The ITTF rules state that the rubbers on a players paddle should be different in colour. The main reason for this is to help the opponent identify which side of the paddle connects with the ball. This helps them judge the velocity and bounce to be able to return the ball.nnYou will find many premade paddles and professional players use different rubber types for each side of the paddle. For example, one rubber may be more defensive, while the other will help with an attacking style of play.