Donic Bluegrip J series

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Apr 2014
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I thought it was Bluegrip C sponge with Bluestar A topsheet, but can't remember where i read that.
Actually it´s a little more complicated, or even a little more of a mixed bag.

The topsheet rubber mixture from Bluestar A is the foundation, sponge structure and topsheet geometry are from Bluegrip C.

Whatever that means...
 
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