If you want to print flexible materials, or just want to get the best performance possible out of your Prusa Mini, then this is a great upgrade to get. The Capricorn XS PTFE has very high tolerances, which lowers the 'wiggle' room filament has in the PTFE tube.
The upgrade is ready to install, on the existing couplers of the Prusa Mini, just remove the old tube, and screw the new one in.
1x Capricorn XS PTFE Tube, For Prusa Mini (+)
1x Capricorn sticker