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Found the video.
https://www.youtube.com/watch?v=ceJFUxpjAr8
He wrote the weight on the packaging.
https://www.youtube.com/watch?v=ceJFUxpjAr8
He wrote the weight on the packaging.
Okay, interesting point! But i thought that all rubbers of one kind like tenergy all weigth the same? Or Do they not? Can not imagine that he use thinner sponge on some rubbers and that is way they are lighter. And Do a heavier rubber need to be harder?