A tonne bag of sand.
A tonne bag of sand made up in store and ready to be collected.
Blocks
A much bigger block with a cavity/hole going through the center.
Chips
The bigger thicker blocks up from the 4"
Concrete block that weighs one tonne.
Gravel
Aggregate mix
3/8" Chips. Very small stones
Regular sized blocks used for most building jobs.
Clause 804
Quarry Products
Drainage stone-small smooth rounded stone
Regular 4" block with a 90 degree offset.