black exhibition boards for show

the big show is on Saturday 7th of Aug and I need to make some boards to present my runner beans ,onions and cucumbers on ,now inve got the black material but ive searched everywhere on the internet for the last two days but I cant find the size the different boards are supposed to be help me stay sane please
let me explain these are the small boards that you put your veg on when you place them on the table
  phil

You could alway paint thick card or hardboard with blackboard paint, which is readily avaialbl in DIY stores 

You could alway paint thick card or hardboard with blackboard paint, which is readily avaialbl in DIY stores  

 

  ive got the wood and the black cloth ready to go just need sizes ta

  were,s medwyn when you need him

Me too!

Are they set sizes then?

I thought you just had something suitably sized. Shows what I know