This refill pack is intended for use with the CalliCreative Switch Tip Pens, versatile pens that come with three tip options: a fineliner, a brush tip and an italic tip all in one pen. Simply remove the Switch Tip and replace with the tip of your choice. Each pack contains ten refills in a variety of vibrant colors.Details:Includes assorted colorsFor use with CalliCreative Switch Tip pens (not included)10 fineliner refillsVibrant color selectionEasy to useExtend the life of your favorite tools