The Leather Dye Pens feature a flexible brush tip on one end and a fine-tip on the other, allowing blending and detailing on leather projects. These are fast drying, blendable, permanent, non-toxic and acid-free markers. These dye pens are ideal for intricate details in tooling and provide the ability to add color to small areas within a design. The leather dye markers have also been used for touching up small spots or blemishes on leather products. The variety of colors make them a great leather craft supply to have in your shop. Available in four separate sets, each including 6 coordinating colors. Colors vary slightly depending on the kinds of leather.