SOFT and ELASTIC: The foamed PU ball is softer than other tennis ball and slideable on the elastic string for rapid elastic reflection. PORTABLE: The whole boxing ball equipment is small and for your exercise in various place. COMPONENTS: Out product includes four powerful suction cups,a piece of elastic string with buttons,a Foamed PU ball. INNOVATIVE DESIGN: Safe and easy to use boxing ball,fixed with two strong suction cups at both ends,and the PU ball is soft which can be adjusted through the elastic string. MULTIPLE FUNCTIONS: Increase reaction speed,concentration,quickness and hand-eye coordination,burn calories,get fitness,body shaping,or relieve your feeling.