A 20" wheel, so a unicycle for older children or adults really. I can't imagine it would stand up to a lot of abuse - I certainly wouldn't want to use it for hockey! Looks like a decent learner unicycle, though.
I've already got a 12" on order for Charlie's birthday, anyway :-)
-- Danny Colyer <URL:http://www.colyer.plus.com/danny/> Reply address is valid, but that on my website is checked more often "He who dares not offend cannot be honest." - Thomas Paine