Now I'm even more confused...I had a look in P@H at the Savic balls they have in there. Their small balls are tiny....I'm not sure where I got my dwarf balls from (most likely Surrey Pet Supplies) but they're sized in between the small (12cm) and medium (18cm) ones by Savic....which is a perfect dwarfie size. All I want is a clear one of those.
And my current clear Syrian balls is bigger than a Savic medium but smaller than a Savic large. Hmm. Note to self: pay more attention to where they come from when buying hamster toys in future!!