Description Glow in the Dark!!!!! The TWSBI ECO fountain pen in Glow Green GLOWS IN THE DARK and features a clear acrylic body and light green cap and turning knob, that glow in the dark silver trim, a piston ink-filling system, smooth-writing steel nib and a screw-on cap. The TWSBI ECO 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. ** Please Note that the TWSBI Eco Green Glow fountain pens can be released for pre-sale starting August 23, and they cannot be shipped, or sold in store until August 25, per TWSBI. ** The traditional mechanism of the fountain pen, combined with a modern industrial design, embodies both the past and the present. This pen runs about the same in length as the Diamond 580 and is just a tiny bit thinner. One difference between the ECO fountain pen and the other TWSBI pens is that the ECO does not have a removable nib unit, and the barrel and nib unit are all one piece. There will not be separate nib units for this pen. 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 nib and feed, as the feed is very fragile, and breakage or cracking could occur.