Built as an 8” (kinder to spine) barrel for thoracic extension exercises and is the standard size for classical pilates. Patent pending rotational alignment handles drastically improve ergonomics of every grip position, allowing for proper alignment of the arm, elbow and wrist Openings in the frame make it lighter and easier to move around, as well as allowing for additional hand placements to accommodate various shoulder considerations for more advanced exercises The new side handles are “flush” so that spine correctors can be stacked for storage (up to 4 high maximum) Retained the classical working geometry of the Classic Spine Corrector Removed all visible fasteners from the outside of the product for a clean, smooth surface and sleek design American made with quality from Baltic Birch