The Yonex PERCEPT 100 is for intermediate to advanced players who are looking for a flexible racket with precision and feel.Features of the Yonex PERCEPT 100:Isometric TM: Developedover 30 years ago, ISOMETRIC's design increases the sweet spot by 7%. Comparedto a traditional round frame, an ISOMETRIC racquet creates a larger sweet spot by increasing the number of intersecting longitudinal and transverse strings inthe hitting area.ISOMETRIC technology  FlexconSystem: FOR RACQUET FLEX AND FEEL. A tapered and elongated box-frame shaft ismade of Flex Force and Flex Fuse graphite for precise ball control2G-NamdFlex Force: FOR INCREASED BALL POCKETING. Flex Force Graphite allows the racketto flex and snap back quickly for more spin and faster ball acceleration fromthe string bedServofilters: Features - A transparent film between graphite increases flexibilityunder pressure and filters out unnecessary vibrations. Result = 60% moreflexible and 500% faster vibration damping than graphite.StiffFace Design: Features - Increases the graphite content of the club surface.This improves ball control by stabilizing the racket surface on impact. RESULT:3% more stability on the club surface. LockBooster: For ball-breaking spin. An improved eyelet design that promotes stringcontact for efficient energy transfer and ball crushing power