RSM, Ariex etc. Any 1 ply Hinoki 10.5 mm thick
or
Yinhe T10+, Agilite Balsa, any Balsa blade thicker than 11 mm.
I believe Sanwei or some other company sold one that was 14 mm or something.
Not sure which is faster as I haven't been able to compare them side by side. I'll vouch for the thickest...