Super tough glass-reinforced nylon plastic resin. Injection-molded.

For use with 3mm (0.116") axles.

Comes with two trees of 24 pieces each:

     8  x   0.4mm / 0.016"

     4  x   0.6mm / 0.023"

     4  x   0.75mm / 0.030"

     4  x   1.95mm / 0.076"

     4  x   6mm / 0.236"