Thats not any gum rubber I am familiar with.
Thos omni wheels must be adding up at 1.6 lb each and oh say 8 of them for your holonomic drive right??
Plus the mounts for them and the encoders as posted previously.
Heh.. the stock wheels alone weigh 12.8 pounds all in all.
JK
Haha, looks great guys. I really do wanna know what the wierd material is though.
until #3...
-Henry