... more efficiency to install between your body seating Seating . USB Massage Ball4 port usb hub, usb light, usb memory hub, hub ... , motorcycle hub, trailer hubs, brake hubGreat quality and competitive priceUSB Massage BallSize: Dia 7*3.5cm The product can be working ... install between your body seating Seating .The product only for massage purpose not medical treatment. Color: blue/black USB ...