These blanks are 12.5mm tubes used with the common Jr Gent sized kits. These sports team blanks pair excellently with team specific stadium seat material found on the University of Michigan's stadium blank pages.
The list below is not a complete list, but it is a great starting point list to find your desired kit.
Still have not received shipping information. I ordered on 4/12/24. It's 4/29/24. When I get my shipment it will be great. Not my first time ordering. But a problem with shipping and receiving.