Styli Style Indigo Flat Liner 24 for Eyes lasts at least 24 hours! The Styli Style Flat Liner 24 is one of Styli-Style’s amazing products that lasts 24 hours and is a semi-permanent product. The Styli Style Flat Liner 24 is an amazing waterproof liner that requires no sharpening. The Styli Style Flat Liner 24 really takes the automatic liner to a whole new level! The Styli Style Flat Liner 24 includes fine lines, wide lines, and medium lines to guarantee any and every style you are trying to accomplish. Flat Liner 24 also is guaranteed to be smudge proof and water proof.