Trials Wooden Cylinders

Does anyone know what those wooden cylinders a lot of people use for trials are called? Anyone know where to get some of these?
If you don’t know what I mean, there in this video to the left of the pallets.

They’re wire spools. They are what long lengths of wire comes on. I personally have never been able to find any but if you see wires being installed you can ask for the spool after they’re done.

Google around and call an electrical supply distributor. They’ve usually got piles of spools in their yards…

To add on to this, where can I get pallets?

I’ve seen pallets advertised free on craigslist in my area.
Spellings of pallets is not always correct so be creative. They’re also knows as skids too.