The Spinalssage JetPak is a simple pulsating massage that targets your mid back region with a soothing pulsating massage to relax and envigorate. Learn more: www.bullfrogspas.com/listings/custom/136/45/spinalssage The JetPak Therapy System by Bullfrog Spas is the only modular hot tub jetting system that can be personalized specifically for you. You choose your jetting configuration, intensity, and the spa seat in which you prefer to place each JetPak. See more at: www.bullfrogspas.com/jetpaks