Olivia,

There are two different internet sites.

Fine Tools

and

Naniwa Germany.

I think you are looking at the Fine Tools site.

If you look at the OFFICIAL NANIWA Site the combination stones do not exist. Also on the NANIWA site, you will see they sell two types of SUPER HONE.

SUPER and SUPER+.

Is it me or you is confused. Best regards.