What in your opinion is the best undersized metal and are their any undersized plastics and also what exactly classifies as a undersized throw. Thanks ;D
My current favorite undersized throw is the Werrd Rozzor. For no reason other than I like the feel of it in my hand.
My favorites are in order the CLYW Campfire then the General-Yo Hatrick.
Undersized is generally 50 or 51 mm in diameter and smaller. There really aren’t any undersized plastics because the density of plastic makes it harder to have any weight and still be small.
My current favorite undersized throw is the Y-Factor. 8)
Well, does a metal rimmed yoyo count? Then in my case it is definitely by YYJ Mini Mo-Tu. 
Yeah, but I think he meant all plastic.
Oh well, in that case, it is the YFF Lunatic.
bump
Mini-Star