rOtring Rapid PRO Retractable Ballpoint Technical Drawing Pen, 0.5 mm, Matte Black (S0949350). This long-lasting, smooth, and precise retractable ballpoint pen is the perfect professional tool for all sketching, writing and drawing applications. The full metal body has an ideal weight balance and a comfortable non-slip knurled metal grip. Leak-proof pen is pocket- and airplane-safe. Pen is refillable and includes a high- quality metal jumbo refill. Limited warranty: guaranteed for 2 years from original purchase date against defects in materials or workmanship.