3/8" Chips. Very small stones
A tonne bag of sand.
Aggregate mix
A much bigger block with a cavity/hole going through the center.
Drainage stone-small smooth rounded stone
Screenings-Very dusty gravel
The bigger thicker blocks up from the 4"
Regular 4" block with a 90 degree offset.
Regular sized blocks used for most building jobs.
Small empty heavy duty sand bag.