This combination pack includes 1 tweets Ultra Fine Tip and 1 Brush Tip Pens. The Ultra Fine tip is amazing for highlighlighting and designing very fine details and fonts. (drys instantly). The Brush Tip is great for filling in fonts and wider designs (allow 20 sec dry time)The tweets Pens are smudge and bleed proof and will resist any extract, vodka or Everclear when mixing with gel food colors, Luster, Petal, Matte and Metalic dust powders. Painting with water is not recomended. Pens are designed to be used on dry Royal Icing, Dry Fondant, Wafer Paper, FlexFrost Fabric, and Gumpaste. The Brush tip is also great to use for outlining on naked cookie surfaces.