There are two versions: soft and medium sponge hardness.
Soft version is fast with strong tensor effect. Fast attack style rubber, very good for direct hitting, not optimal for passive and allround play. Excellent precision for offensive strokes.
I`ve tried this rubber with medium hard sponge in 2.1 width onYinhe Mercury Y-13 blade. Very aggresive rubber for off style. Excellent for smashing, fast counterattack game. Not good at passive game and def style. Tensor effect is hight, hardness is medium-hard, not very comfortable with chops. If you plays more close-to-the-table game, and need powerfull short pips for counter or agressive offensive style - that is your best friend.
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