Specifications:Pen Body Material: Aluminum alloyNib: nylonNib typeBT-2.0/3.0/4.0/5.0 (can be choosed )Pen length: 168MMPen weight:16gHolder materialAluminum alloy, ABSHolder weight26gHolder size56*49*22mmHolder color :Black/Red (can be choosed )Features:Four colors are available, stable holding, not easy to corrode, convenient and fastReplaceable nib: Rotary grip and spring combined with pressure-mounted nib, easy and convenient to operateModel window: After replacing the pen head, the knob and the end of the pen identify the pen head model, which is convenient and easy to understandFine painting: The pen end is hollowed out to make the pen body lean forward, making it easier for fine workNot easy to fadeLong life and durableSimple and convenient operation