Rogue Duo® Hybrid String is a combination of RD 68 mains and RD 61 crosses, which feature BETA Polymer ZyWeaVeTM cores and braided BETA Polymer multifilament wear layers. REPULSION POWER: CONTROL: TENSION STABILITY: DURABILITY: REPULSION POWER: CONTROL: TENSION STABILITY: DURABILITY: FEATURES ADVANTAGES SPECIFICATIONS Material RD 68 & RD 61 - Proprietary BETA Polymer ZyWeaVeTM Core Proprietary BETA Polymer Multifilaments Gauge RD 68 - 0.68 mm RD 61 - 0.61 mm Length RD 68 - 18 ft (5.5 m) set / 345 ft (105 m) reel RD 61 - 17 ft (5 m) set / 315 ft (95 m) reel Colors RD 68 - Black RD 61 - Orange BETA Polymer Technology provides dynamic stiffness and superior repulsion ZyWeaVeTM core prevents tension loss and maximizes strength and durability RD 68 provides ultimate durability and power in main strings RD 61 provides ultimate spin and control with textured, gripping surface in cross strings Usage: Professional and amateur players For optimum combination of repulsion, power and control For minimum tension loss and superior durability Stringing Tension: RD 68 - up to 30 lbs (13.5 kgs) RD 61 - up to 28 lbs (13 kgs) Note: Recommend crosses to be installed at 5% less tension than mains