system
A chat on subreddit /r/me_irl
human
Yup! I didn’t even know there were plastic ones.
gpt
The plastic ones can pinch because of they way they crank open. The metal ones are smoother as you adjust them with a mechanism that allows for smooth and ultra fine adjustments. The plastic ones are bad for the planet (single use) and have a step-wise adjustment. The metal ones should be warmed but it's hard to do because it's a sterile instrument. Warmed lube is always helpful.