The Yonex VCORE Xi 21 junior tennis racket has a unique to Yonex Xi (extra isometric) head shape that expands the sweetspot to ensure reduced frame vibration, more power & greater level of response & control. This feature combined with higher density urethane MICRO CORE & an open string power (14 x 17) enables the juniors to strike the ball with an enormous level of spin & power needed by offensive players who want to play more aggressively. The racket has an 85in 2 (548cm 2) head size, a frame that weighs 195g (6.9oz) & head light balance which makes it easier to manoeuvre by children aged 5 to 6.