Toroline K-PRO

Toroline K-PRO Tennis String

Toroline K-PRO is a co-polyester hybrid string developed in collaboration with touring pro Karue Sell, built for competitive players who demand the maximum level of control, directional precision, and string bed stability from their setup. Combining Toroline's square-profile WASABI mains with CAVIAR hexagonal crosses, K-PRO delivers a high-control, firm-playing hybrid that rewards players who generate their own pace with aggressive, precise groundstrokes — the kind of string setup that locks in spin, keeps launch angles flat and penetrating, and gives serious players a tight, predictable response on every ball.

K-PRO plays noticeably firmer and more control-oriented than its sibling K-POP — where K-POP offers a slightly softer, more elastic feel with additional ball pocketing and touch, K-PRO prioritizes tour-level stiffness, maximum precision, and exceptional tension maintenance for players whose game is built on aggressive directional hitting rather than feel and placement touch. Each package includes two half sets (approximately 6.7 meters each) for one complete racquet restring.

• WASABI Square Mains for Maximum Spin - The WASABI main strings bring Toroline's most spin-aggressive profile to the hybrid — the sharp square edges bite the ball on every contact, grabbing and deflecting through the ball to generate heavy topspin and slice rotation that keeps aggressive rally balls diving back inside the baseline even at high trajectory.
• CAVIAR Hexagonal Crosses for Precision & Stability - CAVIAR's six-sided hexagonal cross strings add exceptional stability, directional control, and tension maintenance to the hybrid — their stiff, precise co-poly construction keeps the string bed from moving excessively during contact, giving main strings a reliable, consistent launching platform on every groundstroke and serve.
• Karue Sell Pro Collaboration - K-PRO was designed in direct collaboration with Karue Sell, a touring professional who tested and refined the string composition specifically to match the demands of high-level competitive play — making K-PRO a setup with real tour-validated performance rather than a speculative laboratory composition.
• Firm, High-Control Response - K-PRO plays at the firm, control-oriented end of the poly spectrum — ideal for players who generate their own pace and spin through high swing speeds and don't need the string to contribute power, but who do need the string bed to stay stable, predictable, and precise under full-force strokes at tour-caliber intensity.
• Exceptional Tension Maintenance - The dual co-poly construction of WASABI and CAVIAR gives K-PRO outstanding tension retention compared to softer string materials, meaning the hybrid maintains its characteristic firm feel and control response over a longer playability window rather than rapidly losing stiffness and becoming inconsistent after the first few sessions.
• Full Spin + Control Hybrid Synergy - The WASABI + CAVIAR pairing works synergistically: the WASABI mains generate spin and controlled power while the CAVIAR crosses restrain the string movement, hold the main strings in alignment between contacts, and contribute directional precision — creating a hybrid that delivers a more complete, complementary performance than either string could achieve in a full-bed configuration.