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.
A much bigger block with a cavity/hole going through the center.
The bigger thicker blocks up from the 4"
Small empty heavy duty sand bag.
An empty big bag.
Drainage stone-small smooth rounded stone
2" clean medium sized stone
3/8" Chips. Very small stones
Concrete block that weighs one tonne.
Regular 4" block with a 90 degree offset.