Blocks
A much bigger block with a cavity/hole going through the center.
Quarry Products
2" clean medium sized stone
Bags
Small empty heavy duty sand bag.
The bigger thicker blocks up from the 4"
Drainage stone-small smooth rounded stone
4" clean large stone
Plastering sand
An empty small bag.
Regular 4" block with a 30 degree offset.
Concrete block that weighs one tonne.