The articles under consideration are identified as Aluminum Folding and Rolling Ramps which feature four foldable panels, a strong handle, and 600 lb. capacity. The ramps are made from high strength, lightweight aluminum and are designed to be portable for handicapped users. The folding and rolling ramps are available in five sizes that measure 48" in length x 28.7" in width, 59.9" in length x 28.7" in width, 71.9" in length x 28.7" in width, 84" in length x 28.7" in width, and 96" in length x 28.7” in width. The width of the ramp accommodates most doorway openings, and the tapered curbs allow exterior doors to open without hitting the ramp. The ramps have a grid-textured surface to provide safe speed control when rolling down and greater traction for wheelchairs even when wet, and an anti-slip mat on the top to prevent it from falling. You indicated that the primary use of the Aluminum Folding and Rolling Ramps is to help disabled people retain their mobility and quality of life.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N320463