Jonnos Battleratz are great and as I understand it he'll be running competitions for them next year.

a very good start and look like a lot of fun but do not think they are built to stand up to a 13.6kg lump jitting it at 15 miles an hour. They are 6kg and are made to stand up to each other!!

If you do use them in a feather arena bring a bin bag

Andy