Ardell DuraLash Flare Medium Black. DuraLash individual lashes are the closest thing to natural lashes ever developed. These exclusive knot-free individual lashes are permanently curled, waterproof, easy to apply, and comfortable to wear. They're so natural you forget they're not your own, and they can be worn for up to 6 weeks at a time. One DuraLash package contains 56 lashes.