My arm is free again!! I hope I'll be ridding verts again with my friends (what's up guys!!) in Lyon next eastern holidays.
The grinders are made of polietileno. The problem with Teflon is that it has a very low coefficient of friction that makes it (for me) very nervous in slides. I personaly prefer a slower plastic. I do long slides with polietileno and it allows you a good control.
Perhaps teflon could work for rusty copings or concrete curbs, but I don't know if a little wax (very little, please) could be better.
Thank you very much for your good feelings!!
Let's rip the verts!