Dear Maria,

I do not know how much but GSI produce such Cup stacked carbon nanotubes.

You can try to contact them.

http://www.gsi.co.jp/en/business/nano/

Best,

Kazu

Thank you very much.

I wrote to GSI and they answered me that they do not produce SCCNT. So the question is still open

That is weird.

This page below is written in Japanese but you can see CSCNT.

They call it Carber.

http://www.gsi.co.jp/business/nano/01.html

Best,

Kazu