Piggy banks are usually made of ceramic or porcelain.[1] They are generally painted and serve as a pedagogical device to teach the rudiments of thrift and savings to children; money can be easily inserted. Many piggy banks have a rubber plug located on the underside; others are made of vinyl and have a removable nose for easy coin access. Some incorporate electronic systems which calculate the amount of money deposited.[2] Some piggy banks do not have an opening besides the slot for inserting coins, which will lead to smashing the piggy bank with a hammer or by other means, to obtain the money within.