Gravel
Aggregate mix
Blocks
A much bigger block with a cavity/hole going through the center.
Regular 4" block with a 90 degree offset.
Quarry Products
4" clean large stone
Concrete block that weighs one tonne.
The bigger thicker blocks up from the 4"
2" clean medium sized stone
A tonne bag of sand.
Chips
Bags
Small empty heavy duty sand bag.