The new BOOM JR combines explosive power with the sensational feel of the innovative new Auxetic construction. Based on the adult model MP - which has a new shape for HEAD - this racquet is aimed at ambitious juniors aged 9-11 who want to take their game to the next level. When juniors play with the BOOM JR all they have to think about is enjoying the moment and hitting the next ball. With a fresh modern design identical to the look of adult BOOM frames this racquet will help kids feel good about themselves and their game. Auxetic constructs show a unique deformation compared to non-auxetic constructs. Due to their inherent properties Auxetic constructions expand when a pulling force is applied and contract when squeezed. The greater the force applied the greater the auxetic respon.