12 tablets per box. (Please note: The box quantity is reduced from 20, but the tablets are larger.)Please note that due to restrictions on postage by air  we are unable to send these outside of the UK. You can use Mamod fuel in Wilesco engines  https://www.forest-classics.co.uk/mamod/burner-trays-and-solid-fuel/mamod-solid-fuel-tablets-packet-of-20  .