This technical drawing pen features a precise, chrome-plated tip and an ink reservoir that can be refilled using bottled drawing ink. Ink flow is achieved by gravity. The Isograph's large ink capacity and wear-resistant tip make it perfect for heavy use. Its push-on nib sleeve makes cleaning fast and easy. Each pen has a color-coded barrel and labelled screw-on cap. Ink is not included.Model Number - ROTRING 1903493 Manufacturer - Rotring Body Color - Dark Brown .Body Material - Plastic. Capped or Retractable Capped - Snap On .Clip Material - Metal Clipable - Yes .Converter-Compatible - No. Diameter - Grip 11.4 mm.Diameter - Max 12.3 mm.Grip Color - Purple. Grip Material - Plastic.Ink Refillable - Yes. Length - Capped 13.0 cm / 5.1 inches.Length - Posted 14.2 cm / 5.6 inches.Length - Uncapped 12.4 cm / 4.9 inches. Tip Material - Metal.Tip Replaceable - Yes. Tip Size (Line Width) - 0.6 mm.Tip Type - Needle Point. Weight - Barrel (with Ink)- 7 grams.Weight - Cap 3 grams.Weight - Whole Pen (with Ink) - 10 grams.