I bought these wire strippers several months ago for my toolbox, since I'm about to embark on a WOPL400 of my own I decided to test them on Teflon wire. I can report that they work really well, nice clean stripping and very minor nicking of the wire. I've tried from 22 to 10 gauge wire with similar results. They also cut wire very cleanly on the end, nice and square and no crushing. They are currently only a bit over $13 on amazon, a real bargain. I cannot attest to their longevity, but at $13 I can replace them easily. Highly recommended for WOPL builders.
NGP
the link
https://www.amazon.com/Capri-Tools-...coding=UTF8&psc=1&refRID=0VH85RPFZJBQJN5DFF7E