Babolat
RPM Blast 125
Babolat RPM Blast 125 is the spin monster of the polyester world. Its octagonal cross-section geometry creates enhanced ball bite, producing higher RPM topspin rates than virtually any other string. Rafael Nadal has used RPM Blast throughout his career, and it remains the string of choice for heavy topspin baseliners who want to hit with extreme rotation and still land balls inside the court. Spin rated 9.5/10 — the highest in our database. The tradeoff: RPM Blast is extremely stiff, generating significant arm stress with repeated use. Playtesters consistently flagged discomfort after extended sessions. Recommended only for physically healthy players with modern, high-RPM strokes.
Ratings
Spin
Power
Comfort
Durability
Tension loss
Full specifications
Pros and cons
Pros
Highest spin potential of any polyester string
Octagonal cross-section bites into the ball for massive topspin
Rafael Nadal's string of choice
Excellent for heavy baseline topspin players
Cons
Very stiff — significant arm stress
Power level too low for players with short swings
Tension drops noticeably after first few sessions
$18
Price per set
$160 per reel
Buy at Tennis Express →Quick specs