Which sports equipment innovation, introduced in the early 1980s, dramatically transformed tennis by allowing for significantly more power and spin, leading to a complete shift in playing styles?

Product development in the sports industry has seen remarkable innovations that have revolutionized how athletes perform. From advanced materials to ergonomic designs, these breakthroughs have pushed the boundaries of what's possible in athletic performance. This trivia question focuses on a pivotal moment in sports equipment evolution that changed an entire sport's trajectory. Test your knowledge about product development milestones in the world of sports!

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• The oversized graphite composite tennis racquet
• The titanium-infused tennis string
• The pneumatic cushioning tennis shoe
• The polyester monofilament string

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