The NeckBlaster JetPak does what its name suggests, it powers out the stress and tension that you build up in your neck, shoulders, and upper back. This is a JetPak massage that you and your hot tub just can't do without. Learn more: www.bullfrogspas.com/listings/custom/132/45/neckblaster 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