craft foam blocks, 4x4 squares, polystyrene bricks for flower arrangements, models, decorations, crafts (2" thick, 12 pack) juvale use this set of 12 foam blocks for crafts, modeling, science projects, or party decorations. the smooth polystyrene foam can easily be customized using stencils, paint, twine, and ribbon, your mind is the only limitation! create one-of-a-kind party decor, floral centerpieces, or signs for an upcoming holiday party or birthday celebration. the foam squares for crafts measure 4 x 4 x 2 inches each. however, the pieces can easily be cut to your desired size or shape.