Features: The stainless steel hook ensures the safety during exercise, and has better bearing capacity. The hinge is upgraded, the lock sleeve is sturdier, and it will not fall off during use. Comes with electroplating lock, with fixed locking device. The inner of upside down boot adopts a thick sponge sheath with a thickness of about 3cm, which is more comfortable to wear and protects the feet from being injured. Helps relieve pain and stretch the muscles of the neck, back and shoulders, separate the compressed intervertebral discs, and relieve back pain. Upside down boot can be perfectly fixed on ankles and feet of any size, which is a practical fitness equipment. Specifications: Component: Steel Color: Black/Blue/Red Color/Black Blue Length: about 18cm/7.09inch Package Includes: 1pair Upside Down Hanging boot note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.