The Red Felt Ball, also known as the B Ball, is a ball for beginners. The foam ball is bigger and slower than a standard ball. It is ideal for adult beginners and children and will improve awareness of the ball, space and the stroke. This ball is 75% slower than a standard ball. Red Felt Ball is 75% slower than a standard ball. Ideal for beginners and children. Applies the recommendations of the ITF and its Play & Stay program. Bag contains 3 red felt balls. Usually for those using 19'-23' rackets.