This ashtray was manufactured from the core of a bitumen road pavement sample. the round body of the ashtray has a semi polished surface through which can clearly be seen section pieces of stone (gravel). The centre of the ashtray is manufactured from machined aluminium and is progressively stepped down over three levels towards the middle. Around the top edge of the ashtray the following has been written in capital letters: ADELAIDE GRAND PRIX 1985.
It is believed that this core sample was taken from the track surface itself. Since the Adelaide Grand Prix was raced on a city circuit, the track was made up of streets of the Adelaide city centre. The sample was taken to test the density and consistency of the bitumen prior to its approval to be used as a race track by the FIA (Fédération Internationale de l’Automobile).