Zebra Pen X-701 Retractable Ballpoint Pen, Fine Point, 0.7 mm, Matte Black Barrel, Black Ink 0.7 mm Fine Pen Point - Refillable - Retractable - Stainless Steel Barrel - 1 Each The Toughest Pen Around! Pressurized barrel withstands extreme temperatures and will write in conditions as cold as -30F or hot as 250F.