Features: 1.High‑strength plastic penholder, durable and neutral environmentally friendly ink, no fading. 2.Safe and non‑toxic imported pen nib supports smoothing ink discharge, practical. 3.Rich models helps such pen suitable for hand?drawn hook line designs sketches, office writing, etc. 4.In addition to being used as a straight section, the needle pen can also be connected to form a circular line or an arc line with the aid of a compass attachment and a compass. 5.Advisable to use and maintain the syringe pen correctly at ordinary times to keep that the syringe pen has a good working condition and a long service life. specification:Item Type: Tube pen Shell Material: Plastic Pen Size: Total Length:Approx. 13.5cm / 5.3in Diameter: Approx. 1cm / 0.4in (Pure manual measurement, there may be minor errors, please refer to the actual product) Refill Color: Black Quantity: 8-PCs set (005, 01, 02, 03, 04, 05, 08, 1.0) x 1 Drawing Designs, There Should Be at Least Three Different Types of Needle Pens: Thin, Medium and Thick: (1) When drawing lines, the pen body of the needle tube should be kept perpendicular to the surface of the paper as much as possible to keep that lines of uniform thickness are drawn. (2) The drawing sequence of the needle tube and pen should follow the principle of up and down, left and right, bend and straight, thin and thick, and the speed and force of the pen should be uniform and stable. (3) When drawing with a thicker needle pen, there should be no pause during pen down and end. (4) In addition to being used as a straight section, the needle tube pen can also be connected to form a circular line or an arc line with the aid of a compass attachment and a compass. (5) It is advisable to use and maintain the syringe pen correctly at ordinary times to keep that the syringe pen has a good working condition and a long service life. The needle tube pen should be capped at any time when not in use to prevent the needle tip ink from drying out. Product Model: 005, 01, 02, 03, 04, 05, 08, 1.0 Corresponding Line Width: 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, approx. 1mm / 0.04in Unit: mm PackageList:8 x Tube Pen