Bags
Small empty heavy duty sand bag.
Blocks
A much bigger block with a cavity/hole going through the center.
Gravel
Aggregate mix
Quarry Products
2" clean medium sized stone
Regular 4" block with a 30 degree offset.
Regular 4" block with a 90 degree offset.
Concrete block that weighs one tonne.
An empty big bag.
4" clean large stone
Clause 804