the black/silver cylinders are supposedly higher quality (more ex too!) but i have had no problems with any of mine
never used the green ones before but have heard feedback on problems with them.
well the big price disparity has to be based on something!
based on NA prices, the black silver ones cost abit below 2 blue notes and are around double the price of the green ones
so go figure
aluminium ones are much more ex as they do not rust and are much lighter
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