Wilson K FACTOR Six One 95 This is a legendary racquet, the model used by Del Potro when he won his first US Open in 2009. Although it's an older model, it's in good condition with few signs of wear, as it has only been used a few times. Please check the photos for the condition. - Brand: Wilson - Model Name: K Factor Six One 95 - Grip Size: 2 The original grip has been replaced with a Wilson replacement grip tape, PRO PERFORMANCE GRIP. A Wilson PRO OVER GRIP is wrapped over that. - String Pattern: 16x18 The strings are Luxilon Alu Power Rough, strung at 50 pounds. - Weight: 310g (frame only)