Pentel Ultra Fine Fineliner Pen 0.6mm Tip 0.3mm Line Red (Pack 12) The S570 Pentel Ultra-fine pen Red ink is ideal for figures and detailed work and can be used easily along a ruler or with a stencil. Its distinctive orange barrel stands out from the crowd, but the key feature is undoubtedly its durable plastic tip, supported by a 4mm metal sleeve. Original plastic-tipped housed in supportive metal sleeve. 0.6mm tip gives approx. 0.3mm line width