Where do I find 1.9mm natural colored PTFE tubes

I have some multi-color hotends where filament is allowed to sit for a while and can swell inside the 2mm PTFE tube,
which makes them too thick to enter the heatbreak anymore.

I'm using those 1.9mm blue capricorn knockoffs from aliexpress, they work fine,
Generally I like the more transparent ones better, but they seem hard too find.

Anyone know a source with international shipping? (Germany)

The color of the ptfe tube made of good ptfe raw materials is transparent.
The color of the ptfe tube made of general ptfe raw materials is milky white.
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