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Alien tennis strings are designed to be extremely durable, without sacrificing tension maintenance and great power. Because of their stiff nature, Alien tennis strings increase spin potential as well. The Alien Black Diamond strings use a proprietary technology which combines stretching and heating to align the chain polymer molecules; this ensures consistent playability throughout the entire life of the string. If you’re looking for an extremely durable, consistent string with nice precision, try Alien and take your game out of this world.

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