Keep your nails healthy and strong on the go with the Perfect On The Go Nail Strengthening Pen Duo. This set includes two ISDIN Si-Nails pens, delivering a fast-absorbing, invisible serum clinically proven to improve nail hardness and flexibility. With an easy-to-use click applicator, achieving strong, beautiful nails and cuticles in just 14 days has never been more convenient. | ISDIN Perfect On The Go Nail Strengthening Pen Duo | Dermstore