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
A much bigger block with a cavity/hole going through the center.
Quarry Products
A tonne bag of sand.
The bigger thicker blocks up from the 4"
Regular sized blocks used for most building jobs.
Drainage stone-small smooth rounded stone
4" clean large stone
Bags
Small empty heavy duty sand bag.
2" clean medium sized stone
Gravel
Aggregate mix