Composed of dense, smooth graphite of the highest quality, our graphite is available in a range of degrees from B to 2H, making them ideal for all graphite applications from professional to engineering and architectural rendering to sketching and drawing. Hi-Polymer Resin Refill Leads engineered for maximum strength and performance. Superior Quality - these leads are more reliable and smoother than standard hi-polymer leads. Durable lead never needs sharpening and produces a clear, dark line when used in your mechanical pencils. Graphite grades: B / HB / H / 2H. 24 leads per tube for 0.3mm-0.7mm. 18 leads per tube for 0.9mm