Nine crab-shaped stones spread across a carpet, a tile floor or a patch of grass to make a wobbling path that asks a child to plan each step. Each stone spans 16 by 11.5 inches and the group carries a combined 180 lbs, so a parent can join the course. Anti-slip foot pads underneath and textured patterns on top keep shoes and bare feet from sliding when the pace picks up. PP shells over TPE grips give the stones a firm shape at a total of 10 lbs, light enough for a 3-year-old to carry one at a time. After play they stack into an 8.5-inch column that fits in a toy bin or a classroom corner. A user guide is included with assembly notes.