Sommer Cable Symbiotic3

The inner conductor insulation cannot withstand the temperatures used used to solder lead-free solder(300C). It's not that big of a deal when soldering the invidual wires since you can simply heat up the contact on the connector and then quickly dip the conductor into the molten solder. The issue is more noticeable when trying to solder the shield as that is obviously wound around the individual conductors and can sink quite a bit of head due to it's bigger diameter.

Soldering this with lead-free solder is definitely doable but I wouldn't buy this again for this reason and would rather look for something with silicone insulation around the conductors.