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Nittaku Hammond X - If you prefer spinny rubbers, you will love Nittaku Hammond X.
An inverted rubber. A new generation based on Hammond, with "Intergrated Energy" (IE), but with new technology "nano-composite," where the chemical component, ground up to nano level, is compounded to enhance the characteristics of each component. Hammond X sponge is 70% synthetic to maximize the spring effect.
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Sponge Thickness: 1.9,2.1