I see the TUSA nets are now back in stock and see that my recollection of the net size was incorrect. No one else noticed either or did not correct my incorrect information.
The two sizes of net mesh offered are 24cm and 27 cm (10.6 in) in diameter.http://www.tenkarausa.com/product_info.php/products_id/113
Not 24cm and 30cm I incorrectly posted earlier.
If you're looking to make a smaller net, either of these sizes looks like the way to go.
The only other decision to make is the color, black or brown or don't care.