Expert Shapers for Weak Nails one side forms, the other smooths, specifically designed for weak nails to achieve salon-quality results at home with the Expert Shaper for weak nails. Full-length is easy to hold for superior control board, with a Cushioning finish for comfortable, flexible, filing cabinet. Fine-grained surface is smooth on weak or brittle nails. Washable and durable. How to use: Always start with dry cloves to help prevent peeling. Use thicker side file to nail to desired length and shape. Use less thick side for smooth edge and nail finish. To help prevent SPLITTING, file in one direction only Tips: Visit Revlon's Expert Tips section to learn how to apply your favorite Revlon products.