Luxilon
ALU Power 125
Luxilon ALU Power 125 is the most widely used string on the ATP and WTA tours, and for good reason. The 1.25mm aluminum-based polyester co-polymer delivers exceptional spin potential and control with a firm, crisp response that tour professionals prefer for its consistency across every shot. Its low-powered trampoline effect rewards aggressive, full-swing ball-strikers with precise placement rather than uninvited power. Durability is best-in-class — playtesters consistently found ALU Power outlasting multifilament strings by 3–4x in head-to-head tests. The tradeoff is stiffness: this string is not recommended for players with arm sensitivity or injury history. For competitive players with full, modern swings looking for the most control-oriented polyester available, ALU Power 125 remains the gold standard.
Ratings
Spin
Power
Comfort
Durability
Tension loss
Full specifications
Pros and cons
Pros
The benchmark polyester string for spin and control
Exceptional durability — lasts far longer than multifilament
Low power trampoline for flat, precise ball-striking
Tour-dominant: used by more pros than any other string
Cons
Arm-unfriendly for injury-prone players
Stiff feel requires full swing to generate pace
Not suitable for beginners or those with elbow issues
$20
Price per set
$180 per reel
Buy at Tennis Express →Quick specs