Designed and manufactured with precision for optimum performance. This is a replacement nib for your favorite rOtring Isograph technical pen. .35mm replacement nib fits S0202270. Crafted from high-quality stainless steel to produce exquisite detail work in drawing. Limited warranty: guaranteed for 2 years from original purchase date against defects in materials or workmanship. rOtring Isograph Technical Drawing Pen, Replacement Nibs, .35 mm.