Sized for medium to large cats up to 28 lbs, this 48-inch wooden exercise wheel has a 43-inch inner diameter and a wide 14-inch track that gives cats plenty of room to run without straining their spine. The wide base adds extra stability so the wheel won't tip during vigorous play, a 0.2-inch security gap helps protect paws, and the soft track mat reduces friction for comfortable play. TPE silent wheels and noise-reducing base holes keep the workout quiet for nighttime use. Rated for a load capacity of 180 to 200 lbs, the frame is built from 0.5-inch high-density wood, and the whole unit weighs 41.9 lbs with a compact 4.36-square-foot footprint. It ships with an assembly manual, gloves, screwdriver, pre-installed hardware, and a cat teaser stick; the hook-and-loop track mat lifts off for easy cleaning. A wheel lock fixes it in place so it doubles as a cozy cat bed when not in use.