Certified Quality: Only Teeter meets the NEW UL 1647 standard. Top Rated: In a report by an engineering group evaluating top brand inversion tables against the UL 1647 requirements, Teeter Hang Ups was rated Number One across all categories. Ergonomic Flex-Technology: Our patented design moves with you, accommodating stretches for greater range of motion. Optimum Decompression Surface: The smooth surface reduces friction, allowing the body to slide and achieve the optimum decompressive stretch. No Tear, No Stain Construction: Flex Technology construction is more durable than typical nylon or vinyl beds vulnerable to wear and tear. The easy-to-clean surface ensures pristine appearance over years of use. Ankle Comfort Dial: The new foot platform design dials up or down for smaller or larger feet, allowing a comfortable and secure fit for the ankle clamps. Precision Balancing: A superior design allows controlled oscillation with minimal effort, promoting fluid movement in the joints, and allows secure lockout in full inversion for advanced exercises and stretching. Stable Base (and added floor protection): Corner feet increase the A-frame base by 20%, and reduce sliding on hard surfaces. Unique and Patented Security Features: Auto-locking Hinges, cam locks, and heat-treated steel parts create a product that is more secure and more reliable Smooth, Quiet Rotation: A de-rattler knob and specialized pivot bearings ensure a lifetime of squeak and rattle-free rotation. High Quality Finishes: Features scratch-resistant powder coating and triple-plated chrome Easy Assembly: The EP-550 arrives 90% pre-assembled. Estimated assembly time of 13 minutes.