Diadem Pro X Hexagon Shaped Copoly/660 ft/200m 1.15 18g Gray Tennis String Reel

The Diadem Pro X Hexagon Shaped Copoly 660 ft (200 m) Reel – 1.15 mm / 18 Gauge is a high-performance co-polyester tennis string designed for players who want a crisp, powerful response with plenty of spin potential. The 660-foot (200-meter) reel provides enough string for approximately 16.5–18 racquet string jobs, making it an economical option for frequent players, stringers, or clubs.

Key features

• Hexagonal profile: The six-sided shape helps the strings grip the ball more effectively, increasing spin and bite on topspin and slice shots.
• Firm co-polyester construction: Pro X is Diadem's firmest and most powerful polyester string, delivering a crisp, explosive response while maintaining good directional control.
• Thin 18 gauge (1.15 mm): The thinnest version in the Pro X lineup, offering:
  • Excellent feel and ball pocketing
  • Maximum spin potential
  • Increased power
  • Reduced durability compared to thicker gauges
• Reel length: 660 ft (200 m), suitable for roughly 16–18 full restrings.

Performance characteristics

• Power: High for a polyester string
• Spin: High, thanks to the hexagonal shape
• Control: Very good, especially on full swings
• Feel: Crisp and responsive
• Comfort: Firm; better suited to players comfortable with polyester strings
• Durability: Moderate for the 18 gauge—the thin diameter sacrifices some lifespan in exchange for enhanced feel and spin.

Best suited for

This string is ideal for:

• Intermediate to advanced players
• Aggressive baseliners who generate fast racquet-head speed
• Players looking for a lively, spin-friendly polyester
• Frequent string breakers who restring often and want the value of a reel

The 1.15 mm (18 gauge) version is generally recommended for players who prioritize feel and spin over maximum durability, while thicker gauges (1.20–1.35 mm) offer progressively longer life and a firmer response.