What's the 'Ball made of?

The Wham-O Super Ball is made of a Zectron, which contains the rubber polymer polybutadiene and sulfur.

Polybutadiene

Butadiene
	Polybutadiene is a diene polymer, that is a polymer made from a monomer containing two carbon-carbon double bonds, specifically butadiene. It is made by Ziegler-Natta polymerization.

Polybutadiene was one of the first types of synthetic elastomer, or rubber, to be invented. It is very similar to natural rubber, polyisoprene. It is good for uses which require exposure to low temperatures. Tire treads are often made of polybutadiene copolymers. Belts, hoses, gaskets and other automobile parts are made from polyubutadiene, because it stands up to cold temperatures better than other elastomers. A hard rubber called poly(styrene-butadiene-styrene), or SBS rubber is a copolymer containing polybutadiene.

Source: http://www-org.usm.edu/~lisproj/polymer/macrog/pb.html

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