Kumpoo JS‑63 is a 0.63 mm ultra‑thin, high‑repulsion badminton string designed for players who want speed, crisp hitting sound, and excellent control. It is one of Kumpoo’s premium Japan‑made JS‑series strings.

Specifications

• Gauge: 0.63 mm (very thin → high repulsion, sharper sound)

• Feel: Soft

• Material: Ultra high‑strength nylon core + high‑strength nylon outer

• Performance: Loud hitting sound, fast shuttle response, good control

• Durability: Moderate (typical for 0.63 mm strings)

• Tension:

  • Recommended: 25–27 lbs 

  • Range: 16–28 lbs depending on region

  • Max: 45 lbs (manufacturer spec)

• Length: 10 m