Its a mystery to me but....

Its amazing what you can find in a second hand shop.  I found this little beauty in a Lifeline shop on Tuesday and been wondering ever since what it is.

Its shaped like a rolling pin with 4 rubber sections that roll independently.  Each section has little rubber suction cups on it.

I thought that perhaps it's a massage tool but after testing it on my partner Craig, we're not too sure (he didn't seem to enjoy it, complaining that it was cold!).

I'm open to ideas, so please make some suggestions, hopefully someone can enlighten me as to what its purpose is. 

Being a typical artist, when I saw it of course I thought 'printmaking'! I'm sure I can make some really interesting organic marks with it......