plastic vs metal washers

[kypyro]

From this thread in November:

Speed up our base tips?

No common engineering materials have less friction than teflon.

Here are the coefficients of dynamic friction for each of the indicated materials running against dry steel or aluminum:

Dry steel: .70
Greasy steel: .23
Nylon: .10
PTFE: .05

in the list above, low values indicate lower friction. PTFE (teflon) is the best, but nylon is good as well.