The lobster elite liberty tennis ball machine is a great training partner for beginner and intermediate players it has a ball capacity of 150 and will send down balls at speeds from 32 129kph 20 80mph and is good for practising against heavy top and back spin balls can be projected at angles from 0 50 degrees and horizontally from one corner to the other of the court in a random pattern to practise a full range of shots the feed rate can be selected between 2 and 10 seconds and the good bat