For those who are interested in the WTC tournament format. These vents have the appropriate dimensions.

If you want to build yourself tournament tables that don't look like they were made in a hurry with what you found in the trash, but without selling one of your kidneys, this product is for you.

Assembled Dimensions: 7" diameter

Sold unassembled and unpainted, figurines and accessories such as vegetation are not included.

Batteries not included and not required.