The Dura pickleball is mostly used for outdoor play. Dura balls are considered the "original" pickleball. The Dura Fast 40 is a heavy outdoor ball. Dura pickleballs are made in China. Formerly called Dura 56 balls, the manufacturer has changed the name to Dura Fast 40. Dura 56 and Dura Fast 40 pickleballs are the same ball - just different names. There are 40 holes, of varying sizes, in the Dura Fast 40 ball. Dura Fast 40 pickleballs are available in white, yellow and orange.