The Vertex line is a very rugged drafting pencil with 2mm lead and smooth click transmission. The plunger cap contains both a sharpener for the 2mm lead and an eraser. The pen is dressed in African Blackwood with an incredibly smooth finish. Specifications: Weight: 39 grams Length: 145mm Diameter: 13mm Refill: 2mm lead Plating: Chrome Wood: African Blackwood