The 1-inch white extra firm base height of this Premium BodyFulcrum™ is preferred for people with flexible backs and want more direct pressure against their body to work their back, shoulders, abs, core, hips, neck, low back, and rotator cuff. Also, great for athletes, golfers, new moms, dancers, tradesmen, laborers, plumbers, carpenters, electricians, police officers, fire fighters, and military personnel who need their backs to be powerful with all day endurance. Great for those who like deep massage. See our YouTube channel, BodyFulcrum.