Blocks
A much bigger block with a cavity/hole going through the center.
Chips
The bigger thicker blocks up from the 4"
Quarry Products
2" clean medium sized stone
Gravel
Aggregate mix
Bags
Small empty heavy duty sand bag.
Regular 4" block with a 90 degree offset.
Regular 4" block with a 30 degree offset.
Screenings-Very dusty gravel