This is my holy grail product. I have sensitive eyes and can't use just any eyeliner. I've been using these glimmersticks for about 3 years now and have never had any eye irritation whatsoever. The retractable designs allows the liner to glide on perfectly. Its even great for upper & lower lids. I love that it doesn't smudge and lasts for hours without reapplying. I always buy & bulk up on them when they are on special in brochure.