The Yonex PERCEPT 100D Tennis Racquet brings a unique 18x19 string pattern, and 10.8 ounce unstrung weight to the PERCEPT series. The racquet uses the FLEXCON System; a tapered and elongated box-frame design for greater precision. Yonex' Flex Force graphite means the racquet can flex, but it snaps back quickly for greater spin and ball acceleration. Vibration Dampening Mesh is NOT in the PERCEPT models. Instead, Yonex added a transparent film between the graphite to enhance flexibility called the SERVO FILTER. The new technology reduces unwanted vibration by 13%. While FLEXCON and SERVO FILTER create a more flexible shaft, Yonex increased the amount of graphite in the racquet face for a 3% increase in stability at impact. Think comfortable flex in the shaft but with a firmer and more powerful racquet head. The PERCEPT 100D is heavier and offers more control than the 100. It is a perfect frame for an advanced player who wants a 100-square-inch control frame. Features: -New Elongated shaft design puts the focus on control and precision -SERVO FILTER filters unwanted vibrations but allows for improved feel as well -100 square inch with a dense 18x19 pattern for control and forgiveness -Isometric head shape creates a larger sweet spot