Capricorn XS series is made from virgin PTFE. This gives it extremely low friction and has a very high temperature resistance. The XS series is of a high precision needed for a 3D Printer. The internal diameter is 1.9mm +- 0.05mm. The 2.0mm internal diameter allows chunky or out of specification filament to be printed. Material filled filaments are a particular use case. The Capricorn XS series formula has added additives to make it the lowest friction PTFE tubing available today, the additives are what gives it the opaque color.
With a low friction tubing minimal extrusion force is wasted pushing/pulling the filament through the PTFE tube. The force of the extruder is getting where it needs to be, at the hotend.
As filament is pushed through a PTFE tube it will bend slightly, this makes filament behave very similar to a spring. If 1mm is pushed at the extruder end, not exactly 1mm will be re-produced at the hotend. A tight tolerance PTFE Tube like Capricorn XS, minimizes this effect. The XS formula also has a much higher temperature range, even greater than the TL series.
Bought in 100mm lengths, multiple quantities will be shipped as a continuous length.