In our experience, we would not recommend using Styrofoam as your needle felting pad. Styrofoam breaks down and crumbles quickly and easily. All of the broken foam pieces can easily get stuck in your project and ruin it, leaving you feeling disappointed for both time and supplies wasted. Instead of needle felting on crumbly styrofoam, try our Earth Harmony Needle Felting Foam Pads, our Green Soy Needle Felting Foam Pads, or our 100% Natural WOW Needle Felting Pads! They are loved by 2D and 3D needle felting artists.