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We have succeeded in producing a totally new rubber using the latest tension technology. Narucross EX has the same speed and spin as old generation rubbers when used with speed glue. The Tension-Inside sheet and sponge will hold the ball firmly and then give it powerful energy. We have produced 2 types of sponge, SOFT and HARD. Soft: sensitive-touch sponge gives good ball control. Hard: reactive sponge produces powerful ball.