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Part from DHL Hurricane National line, those t.t. rubbers are tailor-made for Chen Meng exclusively. The forehand rubber is DHS Hurricane 3 (no. 22 blue sponge) 40 hardness with 2.1mm thick, while the backhand rubber is DHS Hurricane 8 (no. 20 orange sponge) 37 degree hardness with 2.1mm thick.