Blocks
A much bigger block with a cavity/hole going through the center.
Gravel
Aggregate mix
Regular sized blocks used for most building jobs.
Bags
An empty big bag.
Small empty heavy duty sand bag.
Quarry Products
A tonne bag of sand.
Drainage stone-small smooth rounded stone
Regular 4" block with a 30 degree offset.
Screenings-Very dusty gravel
4" clean large stone
Concrete block that weighs one tonne.