Practice golf balls are either specially designed to practice or are selected from regular ball batches because they have cosmetic defects, blemishes and other imperfections but no construction or performance deficiencies. Practice golf balls are great for perfecting your swing, trying new clubs or even playing full rounds at courses where hazards are plentiful. Practice balls are a great alternative to higher priced golf balls if you just want a good ball and don't mind the lack of special markings and custom-built options.