"Different plastics are used to make Wall Walkers. They may be composed of an isoprene polymer (a synthetic rubber), styrene-butadiene copolymer, or a poly(styrene-butylene-ethylene) copolymer along with tackifiers, and coloring materials."

"The Glue Ball® is made of a gel composed of an intimate melt blend admixture of poly(styrene-ethylene-butylene-styrene) triblock copolymer with high levels of plasticizing oil."

Thread from 20 years ago: http://answers.google.com/answers/threadview?id=8085