Signum Pro · Polyester
Signum Pro Firestorm
Round co-polyester monofilament
Price per set$9–12USD, typical retail
Gauges16, 17, 18Metallic Gold
Stiffnessmedium highPolyester
Junior minimum age13+intermediate, advanced, elite
Performance ratings
Power
7
Spin
8
Control
8
Comfort
5
Durability
8
Tension hold
7
Overview
Signum Pro Firestorm is the ATP tour string that helped propel Matteo Berrettini into the top 10. Available in distinctive Metallic Gold, Firestorm offers the classic German polyester combination of spin, control, and durability that tour players demand. The balanced performance profile makes it suitable for aggressive baseliners who want to swing freely while maintaining placement accuracy.
Best for
- Powerful baseliners
- Players seeking tour-level performance
- Spin and control seekers
- Those wanting ATP-proven string
Not ideal for
- Arm-sensitive players
- Beginners seeking comfort
- Players needing power assistance
Pros
- ATP tour proven - Berrettini's choice
- Excellent spin and control balance
- Distinctive Metallic Gold color
- Good durability
- Outstanding value
Cons
- Not arm-friendly
- Firm feel may be harsh
- Requires proper technique
Stringer notes
Standard poly stringing. Metallic Gold finish - distinctive look. Static stiffness: 0.85 kg/mm.
Break-in period
1-2 hours for full performance.
When to replace
Every 15-20 hours or when spin response drops.
Hybrid setup ideas
- Natural gut mains with Firestorm crosses
- Wilson NXT crosses for comfort
Used by
Matteo Berrettini, Mikhail Youzhny (former), Michael Berrer
Specifications
- Type
- Polyester
- Construction
- Round co-polyester monofilament
- Gauges
- 16, 17, 18
- Colors
- Metallic Gold
- Set price
- $9–$12
- Reel price
- $90–$110
- Brand
- Signum Pro (Germany)
Sources & reviews
Data verified January 2025. Something wrong? Send a correction.
- Specs: Signum Pro Official
- Pricing: Tennis Warehouse Europe