The must-have nail care set for stronger and healthier nails. Dynamic Duo includes the best-selling Pure Strength Nail Strengthener and Nourishing Cuticle Oil Rollerball. Both formulas are cruelty-free, paraben free, gluten free, vegan and made in the USA. Nourishing Cuticle Oil is an all-natural, EWG VERIFIED formula that strengthens nails and softens cuticles in a rollerball for on-the-go hydration. Pure Strength Nail Strengthener strengthen and lengthen nails by providing a protective coat and deep nourishment.