The Avocado Stress Reliever is a polyurethane, squeezable foam with slow reaction feature. Once compressed, it takes 5 seconds to retain the original shape. The stress relievers can vary in color, size, texture and density. Although every effort is made for imprint consistency, we cannot guarantee a uniform imprint on each piece. No half-tones. These products are not intended for use by children under the age of 13.