3777 Foam Squares Combo Pack 440/Pkg-White. THERM-O-WEB-3D Adhesive Foam Squares. Add a pop of dimension to your paper crafts and shaker boxes with these 1/8in thick permanent adhesive foam squares. This package contains 440 white foam squares: 352 small (1/4x1/4in) and 88 large (1/2x1/2in). PVC and acid free. Imported. Meets CPSIA (Consumer Product Safety Improvement Act) Standards.