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Kirschbaum · Polyester

Kirschbaum Max Power

Pre-stretched co-polyester monofilament for tension maintenance and durability

Log this string Compare Check price at Racquet Point Find on Amazon Data verified October 2026
Price per set$9–12USD, typical retail
Gauges16, 17, 17LRed, Silver, White
Stiffnesshigh233.2 lbs/in (lab)
Junior minimum age14+advanced, elite

Performance ratings

Power 4
Spin 7
Control 9
Comfort 4
Durability 9
Tension hold 8

Lab test data

Stiffness
233.2 lbs/in
Tension loss
20.9%
Spin potential
5.9

Overview

Kirschbaum Max Power is a firm co-poly that Kirschbaum pre-stretches for better tension maintenance and durability. Tennis Warehouse describes a low-powered, extremely predictable response made for big hitters, and its 2014 playtest called it an old-school poly that is too stiff for beginners. TWU lab data backs that up: high stiffness with low tension loss. It is also one of the cheaper firm polys, with a reel option.

Best for

  • Advanced juniors who hit hard and flat-to-heavy
  • String breakers
  • Players who want tension to last
  • Control-first baseliners

Not ideal for

  • Beginners and young players
  • Juniors with arm pain
  • Players who need free power

Pros

  • Excellent control
  • Low tension loss in lab testing
  • Very durable
  • Low price per set and per reel

Cons

  • Stiff, firm feel
  • Low power
  • Not for young or sore arms

Stringer notes

Pre-stretched at the factory. Firm co-poly: drop tension several pounds versus a multifilament.

Break-in period

Short. Firm from the start.

When to replace

Every 12-15 hours of play, or sooner if it feels dead.

Hybrid setup ideas

  • Max Power mains with a multifilament cross to soften the bed

Specifications

Type
Polyester
Construction
Pre-stretched co-polyester monofilament for tension maintenance and durability
Gauges
16, 17, 17L
Colors
Red, Silver, White
Set price
$9–$12
Reel price
$103–$129
Brand
Kirschbaum (Germany)

Prices outside the US

The prices on this page are US retail in USD. We have not checked UK or Australian prices for this string yet, so we do not list them. Check a local retailer: gauges and colours can differ by country.

Sources & reviews

Data verified October 2026. Something wrong? Send a correction.

What to do next

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