Colorbox-Spark Plaster Magnet Kit: Happy Emoji. Emoji symbols are the coolest symbols there are and Colorbok has taken the craze to a whole new level. Now you can paint your favorite face! This 9- 3/4x6-3/4x1 inch package contains four plaster magnets in four designs, one paint brush and 0.5oz of paint in assorted colors. Conforms to ASTM D 4236. Imported.