Zensations Mechanical Colored Pencils Lead Refills are 2.0mm and provide smooth, rich, vibrant colors that blend easily for shading and color mixtures. This 2.0mm lead holds up to the pressures of beginning writers and never needs sharpening. They are perfect for writing, coloring and illustrations. Each pack includes 30 rich colors and were designed to complement Zensations Mechanical Colored Pencils.