wooden
Not half as scary as a blade manufacturer telling you when asked why the tip weights all weigh the same, to be told that they put the weights in as all the blades weigh the same and you then find the blades weigh up to 250 grams different despite having a standard 150 gram weight just stuck in the end
shouldn't really need to tell you why it makes a big difference if the blades all weigh the same on track and balance !