High frequencies and amplitudes can roll burrs and peen edges. "Peen tong" is used as an ingredient in desserts, sauces and sweet soups. Laser peen induced compressive stresses are also more resistant to heat exposure. The process known as peen plating was developed by NASA. The riveting peen describes a rose-petal path. The PEEN is an internationally agreed approach, built upon the ecological network concept. It has two heads, one flat and the other, called the peen, rounded.