You will find standard pinatas which are broken with a bat or buster. Pull string pinatas are also available. Pull string pinatas are for small children. There are 12-20 strings on the bottom of the pinata. When the right string is pulled, the bottom falls out.
Most pinatas are approximately 1 foot by 2 feet in size. Be sure to see Pinata Fillers and pinata busters. Enjoy shopping for pinatas!