Bring some new energy to the court with the pre-strung Spark Pro Tennis Racket, an ideal option since it's easy for beginners to handle and manoeuvre.. FEATURES. METALLIX. Specially formulated crystalline metal alloy with a grain size 1000 times smaller than that of a typical metal creates a much stronger material. The Hall-Petch Effect states: smaller grains = stronger material. The result is a lighter, stronger and more powerful racquet.. Head (sq cm) Â Â Â Â Â Â Â Â Â Â Â Â 645 sq cmHead (sq in) Â Â Â Â Â Â Â Â Â Â Â Â 100 sq inLength (cm) Â Â Â Â Â Â Â Â Â Â Â Â 68.5 cmLength (in) Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 27 inUnstrung weight (grams) 270g

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