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Chinese long pimples rubber, can be purchased with 0.5mm soft sponge, 0.7 med soft sponge, or OX. Like many other Chinese long pips this rubber has med to low friction. When you block with the rubber the spin reversal is very good, but when you chop without much strength you barely add spin the the ball. It is possible to add a substantial spin on the ball with a chop, but you must chop very hard, and with good timing.