These are usually supplied in soft enamel . They can be single sided or double sided . They can be matched fairly closely to the Pantone range of colours . A double purpose product to save the inconvenience of requiring a one pound coin whilst at the supermarket using a shopping trolley , and can also be used as a normal keyring to hold all your keys . Ideal for promotional purposes to promote your company image , or to be used by charities to sell for fundraising purposes.