ITEM NAME:Polystyrene Styrofoam Filler Foam Beads Balls Craft Colors 2.5-3.5mm O8A5 Polystyrene Styrofoam Filler Foam Beads Balls Craft Colors 2.5-3.5mm O8A5.Material:Polystyrene foam. Also perfect for kids projects,as a educational foam ball can develop their imagination. You can make your own design and painting,really can give you more fun from this activity.