Shu Uemura Hard Formula Hard Acorn 06 1 piece Instant purchase OK Hard 9: The hardest core. Can be sharpened into a "naginata" shape. Ideal for drawing fine lines when drawing individual eyebrow hairs. * Although we inspect the product before shipping, we are amateurs, so please refrain from purchasing if you are looking for a perfect product. * I will do my best to ensure a pleasant transaction, so thank you very much.