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
Quarry Products
Drainage stone-small smooth rounded stone
Plastering sand
A much bigger block with a cavity/hole going through the center.
The bigger thicker blocks up from the 4"
Bags
An empty big bag.
Small empty heavy duty sand bag.
A tonne bag of sand.
Concrete block that weighs one tonne.
4" clean large stone
Chips