Grass fed. Horseshoe magnets can pick up and carry their baby and food marbles. North and south poles are marked on the horseshoes' feet. Perfect for small groups or play at home. Each themed set of horseshoes (pig, horse, donkey, and duck) and marbles (babies and food) also includes an activity booklet (literacy, math, science, fine and gross motor, and social-emotional activities) and animal fact cards featuring color images and fun facts. Horseshoes measure 4.5" H. Each set includes 4 Mini Horseshoe Magnets, 20 Magnet Marbles, 4 animal fact cards, and activity booklet. Ages 4+/Grades PreK+.