The smell of these markers is absolutely awful!! Ive used several acrylic markers before from different brands without an issue, and these smell absolutely horrid and toxic. I only used the marker for about 10 minutes and started getting nauseous, and the start of a migraine. I did use in a well ventilated area, as well as had my fan going and the smell is just lingering. They also do not work well on paper as they claim, it kept pulling up the paper and causing it to pill. The price may be great, but they are not worth it, especially if you get migraines, or are sensitive to smells.