Tourna Big Hitter Silver7 Tour Poly tennis string features 7 sharp edges for massive spin FEATURES: 7 Sided Co-Poly that bites the ball and snaps back quickly Features Massive Spin and Control Control Oriented Silver Color -Formulated for Pro Players -Similar to Babalot RPM Blast, Luxilon ALU Power, and Solinco Tour Bite -Rated as the best Tension Maintenance Poly EVER – so play stays consistent over time -Top 3 in Spin Potential & Top 4 Strings Overall of all Poly Strings Tourna Tennis String S7TOUR-200-17