Hero Arts-Mounted Stamps Mini Tub: Valentine Messages. Hero Arts Wood-Mounted stamps are made with lightweight wood, foam and red rubber to give you solid stamping performance. With designs for the everyday and special occasions you are sure to find the perfect stamp. This package contains twelve unique woodblock stamps, one 4- color pigment cube and gems within one 3x2-1/2x2-1/2 inch tub. Acid free. Conforms to ASTM D4236. Made in USA.