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Nano Speed-100 Flex Flexible Material Frame: Carbon Graphite, Shaft: CARBON NANO TUBE Stringing Recommendation 3U Main: 17-22 lbs. Cross: 17-22 lbs. Recommended String BG65Ti, BG70Pro  Yonex nano-structure uses nano-size particle of fullerene and carbon. The Yonex Nano-particle engineering process gives Yonex sensitive control over how the racquet materials function at the molecular level. The Process establishes a high-performance molecular bond of the materials and creates a stable, thinner and stonger headlight racquet that delivers maximum powr and speed from a compact swing. Rounding corners realize the frame's full power potential. Instead of seating the string on the sharp points of a traditional grommet hole system, Muscle Power seats the string on Round Archways that cause no string stress-load and fatigue through contact friction. The construction creates total unity of frame and string because they are in much closer and tighter contact. The face stability that results from rounding the corners lets you smash with a new magnitude of aggression. "Durability" helps hold tension. Compared with the Muscle Power construction, a conventional racquet's less durable construction demonstrates a sharp and progressive curve of diminished string tension over time. String tension remains at its peak. Seven days after stringing, the stringbed of the Muscle Power Frame continues to provide constant high resiliency for powerful hits. Energy transfer is maximized. No energy is lost. No energy is wasted. Compared with a conventional racquet, the Muscle Power construction keeps the frame and string in closer and tighter contact, so that they function as a single unit to transfer the full magnitude of smash energy at impact directly to the shuttlecock. At the split-second of impact, the entire frame "receives" the full magnitude of the hit, instantly snapping the shuttlecock away from the explosive power.