Description The Dunlop Stage 3 Training Ball is a standard construction ball designed for beginners. A larger size makes it much slower and enables players to serve, rally and score from the very beginning. This ball is suitable for beginners of all ages and for use indoors and outdoors. Dunlop Stage 3 Training Balls are ideal for… USTA QuickStart Tennis: 36 Foot Red Level. ITF Play and Stay: Stage 3 (Red)..