We recommend purchasing a package of 2 and here's why: With the two different weight options, the Changeup Circle®  provides a great way for pitchers to keep the correct motion, and when alternating between the 5oz and weighted Changeup Circles®  (8oz, 10oz), and then to a regular baseball, you really create the ultimate feel for the pitch/throw.  If you work with all ages, the 3 pack would be the way to go.