Our nail care pens contain glycerin, calcium pantothenate and panthenol. It strengthens nails and prevents them from becoming brittle. Promotes growth and stores vitality. Deep nourishes and improves dry nails. The way to use it is simple: before using, twist the bottom half of the pen until you see the product on the brush. Alternate the use of biotin hardener and calcium hardener on your nails every night for at least 6-8 weeks. The unique formula makes nails stronger and less damaged; Instantly increases the natural shine of your nails.