The Yonex EZONE 26 inch Sky Blue Junior Tennis Racquet 7th Generation Prestrung is an all-graphite junior model with extraordinary power. Recommended for junior players 9-11 years old. Technology: Isometric - Developed over 30 years ago, the Isometric design increases the sweet spot by 7%. Compared to a conventional round frame, a square-shaped Isometric racquet generates a larger sweet spot by optimizing the intersection of the main and cross strings. Isometric technology delivers greater control without sacrificing power. Oval Pressed Shaft - First introduced in 1969 with the T-7000 - Yonexes first aluminum tennis racquet - the Oval Pressed Shaft (OPS) is still incorporated into their most popular racquet series today. The Oval Pressed Shaft is designed to give players more spin, control, and feel. The shaft flexes at impact, increasing dwell time and minimizing vibrations. Vibration Dampening Mesh - First used in snowboards to reduce vibrations at impact, Vibration Dampening Mesh (VDM) is now used in four Yonex racquet series. VDM is stretchy mesh material that is wrapped around the graphite within the grip to filter unwanted vibrations and improve touch and precision. Aero Shape Design - For a plush feel. An inverted frame design with a thinner frame face results in a softer racquet. The Yonex philosophy has always remained the same: to contribute to the world through innovative technology and the highest-quality products.