lithophane base, the base is 150mm long, you can put a photo printed with lithophane technology of a length of 150mmx100mmTo complete the base the following. Components are required:2x 12v G4 LED bulbs1x A 23 battery1 or 2 battery holders for A231x 2 Pin SPST Mini Switch2x GU5.3 MR16 lamp holder.