For the higher value coins, 10 yen and above can be used in most machines. This includes vending machines, train ticket machines and IC Charging spots and ticket dispensers inside many restaurants. For the smaller value coins, 1 and 5 yen, these are good to keep handy for exact change. For example, buying anything from a shop or store, especially convenience stores. The other way you can put them to good use is at the Pocket Change stations found at airports, information centres and other key spots.