[Size] Shaft diameter 10mm x depth 11mm x length 143mm / weight 18g. Ball diameter : 0.5mm. Pentel is a Japanese company that manufactures and sells Stationery and office supplies (art materials, writing instruments, etc.), electronic devices (touch panels, touch switches, pen tablets, etc.), industrial robots, industrial automatic assembly machines, precision molds for injection molding, precision hand presses, chemical products related products (cosmetics Parts, medical equipment etc). For over 70 years, Pentel has supplied the world with the highest quality products. Pentel is the only writing instrument company to receive the Deming Award for recognition of the highest standard of quality. Pentel invented roller ball technology...the smoothest way to express ideas. Pentel pioneered graphite lead and our Super Hi-Polymer Lead is the market leader. Our mechanical pencil inventions remain the hallmark of the industry. Every Pentel mechanical pencil, lead, eraser, pen and correction fluid is manufactured by our own factories. No other manufacturer can match this commitment to manufacturing excellence. Pental sponsor numerous educational programs and donate products to libraries, schools and organizations of need. Pentel proudly offers a environmentally friendly line of writing instruments, Recycology. Our product's dozen boxes, master cartons and blister cards are printed on recycled and recyclable materials. Pentel is working with you to create a healthier environment. At Pentel, your satisfaction is guaranteed. Every product is backed with a lifetime warranty against defects in materials and workmanship.