The Ultra 100L is a great tool for the intermediate player looking for an easy swinging racquet that feels explosive on full swings. It should also work for the strong beginner who wants a frame that will reward continued improvement. At 10.4 ounces strung, the Ultra 100L swings faster than the Ultra 100 Countervail, making it easier for you to generate the head speed required for effective pave and spin.This model also comes with Wilson's Uncontaminated Design, which means it has the same bold simplicity and velvety paint finish found in the iconic Pro Staff line, co-designed by Federer. Thanks to the Carbon Fiber layup, the Ultra 100L's string bed not only feels solid and lively, but it lacks the typical "dead zones" found in many light racquets. To help with stability and control, the Ultra 100L features a structural reinforcement in the shaft (called Power Rib). This technology also features Crush Zone grommets in the throat.