Bags
An empty big bag.
Quarry Products
Drainage stone-small smooth rounded stone
4" clean large stone
Blocks
A much bigger block with a cavity/hole going through the center.
Chips
Regular 4" block with a 90 degree offset.
Gravel
Aggregate mix
Concrete block that weighs one tonne.
Regular sized blocks used for most building jobs.
Regular 4" block with a 30 degree offset.