Wilson Ultra 100UL v4.0 Tennis Racquets : For any player seeking ultra-lightweight, arm-friendly comfort in a power-oriented performance frame, look no further than the Wilson Ultra 100UL v4. While this frame optimizes maneuverability for quick exchanges at the net, it also dials up the power through an expanded Sweet Spot Channel and a Crush Zone grommet system. These features increase grommet movement and extend dwell time for better depth on various shots. Boasting a sleeker geometry coated with a color-shifting matte finish alongside eco-friendly bumper and grommet materials, this racquet impresses in many ways. Racquet Technology Lightest frame in Ultra v4 series for arm-friendly swings FORTYFIVE strategically embedded into the lay-up provides enhanced stability while increasing comfort Revolutionary design integrates beautiful, color-shifting blue tones with a matte finish for captivating look Expanded Sweet Spot Channel features a cavity on the inside of the frame to extend cross strings and increase grommet movement for more power Crush Zone grommet system compresses at impact to boost power and ball dwell time on strings Revised geometry applies a more comfortable, ergonomic design and reduces bulk while maintaining stability Parallel Drilling provides a consistent, more forgiving string bed response Agiplast plant-based bumper, grommet and end cap components reduce environmental footprint