Power Crystals / Mighty Morphin Power Rangers Original prototype was cast from resin in a cone shaped mold and sanded smooth and molded. Crystals are cast from clear resin dyed to appropriate color. Resin power coins are cast and painted and glued to the flat top of each crystal and the entire piece is clearcoated. Set contains 5 individually dyed crystals that required a 3 day process per crystal for correct drying, coating, and finishing.