Craft Foam balls are the foundation of many fantastic crafts projects and decorations. Polystyrene Foam is simple to decorate, yet yields professional looking crafts. Use as a base for floral arrangements or craft centerpieces. Teachers love foam balls for science projects and models; you can even create a model solar system with the large selection of sizes! These balls are popular for creating and decorating holiday ornaments and decorations. So get out some tissue paper, sequins, paint and glue, and let your creativity start running! Foam Balls measure 4" in diameter. Each pack includes 12 craft foam balls.