Teflon® PFA is a perfluoroalkoxy copolymer resin. It can offer continuous service temperatures up to 260°C (500°F). Teflon® PFA provides superior creep resistance at high temperatures, excellent low-temperature toughness, and exceptional flame resistance. 
It also has a very low coefficient of friction compared to most other plastics. 

The listed price is per 100mm. 
If you want 600mm order quantity of 6 and it will be supplied in 1 length of 600mm. 
ID: 2mm OD: 4mm 
Ideal for use with 1.75mm diameter PLA and ABS filaments. 
This is the smaller size shown in the photo with a piece of PLA from Diamondage sticking out of it. 

This is suitable for use in a Bowden type extruder for a Reprap machine or 3D printer.