25% of women are worried about chemicals in nail polish and most of them are interested in natural products. To meet their needs, OPI imagined Nature Strong , their 1st varnish certified vegan and formulated with up to 84% bio-sourced ingredients . No compromise on quality, the multiple shades of OPI Nature Strong varnish allow you to obtain a brilliant manicure that lasts up to 7 days . In addition to its responsible formulation, the packaging of Nature Strong varnishes is created from 100% recycled material and the bottles from 20% . For the preparation and the finish, there is only one product: the base & top coat . This 2-in-1 treatment reduces the number of products used. A plus for us and for the planet! From the purest shades to the most colorful shades, Nature Strong presents a palette of 30 colors , each one more crisp than the next.