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
3/8" Chips. Very small stones
Bags
An empty small bag.
Gravel
Aggregate mix
The bigger thicker blocks up from the 4"
Quarry Products
Plastering sand
Regular sized blocks used for most building jobs.
Concrete block that weighs one tonne.