rubber is part of:

rubber contains:

Full expansion for rubber:
   100%  34-Tooth Rubber Tank Tread
   100%  Rubber Belt from 1782
   100%  Rubber Belt from 1822
   100%  Rubber Belt from 5561
   100%  Rubber Belt from 5988
   100%  Rubber Belt from 8213
   100%  Rubber Belt from 8226
   100%  Rubber Belt from 8232
   100%  Technic Rubber Belt
   100%  14L DUPLO 16-Leaf Rubber Vine Piece
   100%  19L Hollow Rubber Hose
   100%  51L Pneumatic Tube
   100%  77L Pneumatic Tube
   100%  7L Pneumatic Tube
    80%  Rubber Hose w/ End Connectors