What it is: OPI Strengthener is an essential step for the woman who wants strong nails and a long-lasting manicure or pedicure. What it does: Use it alone on bare, natural nails as a treatment or as a base coat under polish. Its maximum strength Formula contains hydrolyzed wheat protein & calcium. What else you need to know: The Strengthener is packaged with a stylish, gold bangle that had an OPI nail polish bottle charm! How cute!