Self-sharpening eyeliner: meet the liner revolution! Our Stay Sharp technology helps you keep your tips sharp for a precise application every time. The Stay Sharp secret is in the cap! Its twist-on cap includes a sharpener. Every time you close the cap, the blades sharpen the tip to perfection and neatly hold onto the shavings. Blends easily after application. Long-lasting hold up to 10H. Smudge-proof and transferproof. No fuss, no mess!