Weider Black Inversion System Inversion system helps decrease pressure on spine and increase blood flow to body's extremities Six preset inversion settings and InvertSelect adjustment help you release muscle tension and tone your musculature via gradual stretching Provides quick-adjust feature that allows you to lock into six unique inversion angles, ranging from 15 to 90 degrees, in 15-degree increments AxisSelect Center-of-Gravity Adjustment, enables to customize your rotation speed with four-position adjustment, altering speed at which you train Includes limited 90-day manufacturer's warranty