Description The TWSBI Vac700R fountain pen in Iris is a departure from the piston filler fountain pens found in the rest of the TWSBI lineup. The TWSBI Vac700R fountain pen has a clear acrylic body, which makes checking the level of your ink a breeze, accented by a clear grip section and turning knob. The smooth writing steel nib, rainbow frosted clip, and rainbow trim accents make this larger sized pen a real workhorse! The Vac700R fountain pen has been updated from the original Vac700 fountain pen by modifying the 2 valves in the older version into one valve in the new model. The grip and feed section of the pen has also been enlarged and tapered, which combined with the valve modification, increased the ink flow of the pen by a small percentage. Because of these changes to the pens and nib units, the TWSBI stainless steel Vac700R replacement nib will fit only the new Vac700R fountain pen, and will NOT fit the older Vac 700 pens. This vacuum filler pen holds a LARGE amount of ink, and fills by unscrewing the end cap, pulling it out, and then the pen fills on the downstroke. Be sure to hold the pen in the ink for several seconds after pushing the end cap in, and for best results, you should do this twice. The TWSBI Vac700R fountain pen fills with bottled ink only, and for best filling results, the TWSBI Vac 20A ink bottle is a wonderful option. 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 a full review of the Vac 700 here at our blog!