Stage 1: Balls 25% slower than regular ones. They are the final stage before regular balls. Ideal for children aged 9 to 11 and intermediate-level adults who play tennis as a hobby.
Stage 2: Balls 50% slower than regular ones. Ideal for children aged 8 to 10 and beginner adults who have taken 5-10 lessons.
Stage 3: Balls 75% slower than regular ones. Ideal for children aged 5 to 8 years and adults picking up a racket for the first time in their lives.
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