Hardly used. Some of them never used at all. I just don't use them and would love someone to get them who actually would. Double-Ended Art Marker - Assorted Colors, Pack of 72, Prismacolor The ink has minimal odor, which makes it ideal for prolonged use. The double-ended marker has a small nib and the other side features an ultra-fine tip. The ink is formulated to give the richest color saturation with silky smooth coverage. Assorted Colors, Pack of 72 Double-ended markers Non-Toxic, alcohol dye-based ink Roll-resistant cap