A much bigger block with a cavity/hole going through the center.
Concrete block that weighs one tonne.
4" clean large stone
Regular 4" block with a 90 degree offset.
The bigger thicker blocks up from the 4"
2" clean medium sized stone
Regular sized blocks used for most building jobs.
Small empty heavy duty sand bag.
An empty small bag.
3/8" Chips. Very small stones