Kirschbaum Black Shark Tennis String Reel - 660 ft.

The Kirschbaum Black Shark is an octagonal co-polyester racquet string engineered for baseliners who want maximum spin, precise control, and strong feel. Built on the same proven material as Pro Line Black, the shaped profile bites into the ball more aggressively than a round string — making it a go-to choice for hybrid setups where spin on the mains is the priority.

Key Features

• Octagonal Profile: The eight-sided shape grips the ball at contact and snaps back faster than round strings, generating more spin on topspin groundstrokes and serves without changing your swing.
• Maximum Spin Potential: Purpose-built for players who want to push spin to its limits — the shaped profile outperforms round co-polyesters in spin generation at every gauge.
• Precise Control and Feel: Delivers a connected, direct feel through the string bed, giving you clear feedback on shot placement during fast baseline exchanges.
• Pro Line Black Foundation: Based on the same co-polyester compound trusted by tournament players, bringing proven dynamic response and tension maintenance to a spin-focused string.
• Ideal for Hybrid Setups: Pairs naturally with softer, more powerful strings on the crosses — giving you spin and control on mains while the cross string adds comfort and power.

Specifications

• Brand: Kirschbaum
• String Family: Pro Line
• Material: Octagonal co-polyester
• Gauge Options: 17 (1.25mm), 16 (1.30mm)
• Color: Black

Who It's For

• Baseliners who rely on heavy topspin and need a string that maximizes spin without sacrificing control
• Players building a hybrid setup who want a proven, spin-focused co-polyester on the mains
• Anyone who has used Pro Line Black and wants more spin from the same trusted material base
• Competitive players who string frequently and want a shaped string that performs consistently at tournament level