An empty small bag.
An empty small bag which can be filled with 4 stone weight of sand, gravel or chips. Bought on its own as an empty bag.
Blocks
Regular sized blocks used for most building jobs.
The bigger thicker blocks up from the 4"
Gravel
Clause 804
Regular 4" block with a 90 degree offset.
Quarry Products
Drainage stone-small smooth rounded stone
Bags
An empty big bag.
A tonne bag of sand.
A much bigger block with a cavity/hole going through the center.
Regular 4" block with a 30 degree offset.