[mloskot]

I just found this portable device for fingers and upper body training

http://www.thegripster.com/

It looks like a good alternative to the small portable fingerboards used for warm-ups outdoors:

http://www.beastmaker.co.uk/blogs/news/6453062-the-portaboard
https://www.facebook.com/l.php?u=http%3A%2F%2Fwww.planetfear.com%2Farticles%2FFingerboard_Training__Advanced_1103.html&h=cAQEgQFAG

[Moo]

No it doesn't

[mloskot]

No it doesn't

Then you seem to imply this is no good for fingers training either.
Can you elaborate what makes the difference between edges on fingerbaord work and edges on the gripster likely not?

[andyd]

I see what you mean, however I'd want it to be wooden.

[duncan]

I see what you mean, however I'd want it to be wooden.

Like The Wedge perhaps?

[andyd]

I'd be disappointed if these didn't come with some sort of beater/stick thingy like some primary school musical instrument