Morrisons hole button mushrooms

[shell_y]

They are in just salt and water, tinned. Superfree or not? I can't see why not but can't find them on website.
When I input into syn calc they say 1 syn but it's only salt and water.
Thoughts please

 

[Lovely_Laura]

They are free.

 

[shell_y]

Free or superfree?

 

[Lovely_Laura]

I'm not sure, I'd assume superfree like normal mushrooms but I could be wrong.