You are going to have a very hard time cutting that tubing, I use the soft but it requires very good cutting technique using the correct blades. I would recommend using the regular hardness. Better to have it harder but cut properly than soft and improperly cut, unless you trust your cutting skills.
I also don't see why you would get the imperial stuff when you can get metric 6mm ID 8mm OD. The OD will be 0.4mm small but with no affect on performance as long as the inside is flush.
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