Signum Pro polyester
Signum Pro Plasma HEXtreme
Hexagonal co-polyester monofilament
Data verified January 2025
$10-13 Per Set
16L, 17, 18 Gauges
medium high Stiffness
13+ Min Age
Junior Player Guide
For Parents Arm Friendliness Low
Cost Effectiveness Great value
Recommended Level
Tension for Juniors
48-52 lbs for juniors. Hex shape grabs ball - can string lower.
Gauge Recommendation
17 (1.25mm) for best spin/durability balance.
Overview
Signum Pro Plasma HEXtreme was one of the first hexagonal shaped strings on the market, pioneering the shaped poly category that has become so popular. The six edges provide excellent ball bite for spin generation while maintaining the tension stability Signum Pro is known for. Built on the proven Plasma foundation with enhanced spin potential, HEXtreme offers German engineering in a modern spin-focused design.
Best For
- ✓ Maximum spin seekers
- ✓ Heavy topspin baseliners
- ✓ Players with western grips
- ✓ Those wanting pioneering shaped poly
Not Ideal For
- ✗ Arm-sensitive players
- ✗ Flat hitters
- ✗ Those seeking soft feel
Pros
- + Pioneer of hexagonal shaped polys
- + Excellent spin from 6 edges
- + Good tension maintenance
- + German quality engineering
- + Distinctive orange color
Cons
- − Not arm-friendly
- − Firm feel
- − Less durable than round polys
Specifications
Type polyester
Construction Hexagonal co-polyester monofilament
Gauges 16L, 17, 18
Colors Orange
Set Price $10-$13
Reel Price $120-$145
Used By
Hybrid Setup Ideas
- Natural gut mains with HEXtreme crosses
- Wilson NXT crosses for comfort
Stringer Notes
Hexagonal shape - string carefully. One of first shaped polys on market.
Break-in Period
1-2 hours for full spin potential.
When to Replace
Every 12-18 hours or when edges wear smooth.
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