Many players don't think that this is really possible. But keep in mind that with normal rubber, part of the reason you can spin the ball is because there is plenty of grippy contact between the table tennis ball and the topsheet of the rubber. So if the long pimples have grippy pimple tops and pimple sides, then when the pimples bend there can actually be a lot of rubber contacting the ball. Borrow a friend's pimpled rubber sometime and press the ball into the surface, and watch how the pimples bend and how the amount of contact with the ball dramatically increases.
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