The Stows only come in one size so I guess you're looking at the Black 'n Whites?
I had them. The hockey sticks, chains and weights are made from plated steel - not stainless steel. The result is they rust, badly. Mine went rusty within a season so I complained to Korda and they sent me another set free of charge. The replacement set rusted in 6 months.
If you look back at the last few Korda vids you can actually see this. In the Korda Masterclass vol 7 vid Dan/Pecky go to a lake in Germany. There is a close up of Pecks rods and you can see his bobbins are completely rusted, juts like mine. I saw it on another vid too but can't remember which one.
It's a shame as functionally they're decent; a nice, simple, do-everything bobbin. But the fact is they aint up to the job when it comes to longevity, which is completely unacceptable when you're paying 75 quid for a set.
Avoid buddy.