Description The TWSBI Mini fountain pen in Classic features a clear acrylic body, black cap and turning knob, silver trim, as well as a piston ink-filling system, smooth-writing steel nib and a screw-on cap. The cap of the TWSBI Mini fountain pen screws on to the end of the barrel to post. This pen runs smaller in length than the Diamond 580. The TWSBI Mini piston ink-filling system uses only bottled ink and the clear body allows the user to view the level of ink remaining in the pen at all times. The pen cap has an inner cap liner that maintains a thorough seal when the pen is not in use. The traditional mechanism of the fountain pen, combined with a modern industrial design, embodies both the past and the present. TWSBI believes that it is important to allow the user to disassemble and reassemble the pen, in order to completely experience the traditional aspects of owning and using a fountain pen. The TWSBI pen packaging includes a wrench and silicone grease. ** Please note that these accessories are not intended to be used immediately, as they are better used for long-term care and maintenance. In addition, please use extra care if you choose to disassemble the pen, as breakage or cracking could occur if done incorrectly. Read our review of the Mini here at our blog!