This 4 pack of Essential Acrylic Paint Markers is from Spectrum Noir for Crafter's Companion. These markers are a water-soluble acrylic paint. They have a 3 mm fine tip. They are nontoxic. These markers can be used on wood, metal, plastic, ceramic, glass, stone, paper, cardstock, and more. You get a gold, silver, black, and white marker in this package. This product is sensitive to heat, for best results, store at room temperature.