From Encyc

Rubber is an elastic, bouncy material made from rubber trees, or synthesized in laboratories. It can be vulcanized to make stronger. It is used in toys, vibration-reduction systems, gloves, and automobile tires.

In the movie, Kingpin, the character played by Woody Harrelson is known as the "man with the rubber hand". He was Munsoned, left with some goons who fed his hand into a bowling ball return.