4.5 Inch Foam Balls - 6Pcs Smooth White Round Polystyrene Ball Craft Supplies. These white foam balls are made of high quality, durable polystyrene material, safe and non-toxic, lightweight and easy to carry, can be used for a long time. These foam balls are great for school projects, party decorations, Christmas decorations, DIY crafts, etc., can be painted and decorated with different colors, suitable for various scenes. Our foam balls are perfect for various DIY projects, such as photo props, balloon arches, party decorations, classroom activities, wedding decorations, etc. These white round balls are perfect for any occasion or project you can imagine.