Charles Goodyear's Synthetic Rubber

Origin
Charles Goodyear (December 29, 1800 – July 1, 1860) was an American self-taught chemist and manufacturing engineer who invented and developed a process to vulcanize rubber in 1839, which he improved while living and working in Springfield, Massachusetts in 1844, and for which he received patent number 3633 from the United States Patent Office on June 15, 1844.

Effect
When held, the user becomes elastic. They can strech any part of their body without harm. The exact limit is unknown. Overuse will cause the user's skin to become rigid, causing them to become paralyzed.