3 Inch Styrofoam Balls Bulk Wholesale 72 Pieces per package. The Styrofoam balls are 2.8 inches in diameter. We carry a large selection of Styrofoam Craft balls. Foam balls are lightweight, durable and strong which make it a perfect base for all your craft projects Including: floral arrangements, school projects, topiaries, ornaments, holiday projects, party decorations and many other applications. They are very easy to cut which makes them great for school projects such as a solar system model. We carry a huge selection of styrofoam balls in sizes 1 inch, 1.5 inch, 2 inch, 2.5 inch, 3 inch, 3.5 inch, 4 inch, 5 inch and 6 inch. Styrofoam products can only be painted with acrylic paints. Do not use spray paints because it doesn't come out looking good because the balls just absorb the paint. We promise to be extra careful in packing your orders to make sure you get your products in tact.