In album: http://soundcloudcommunity.org/exoslim/
The rubber ball and a metal cocoon The operating principle of expander in the form of a rubber ball or a metal cocoon is very similar to the principles of the rubber rings. When creating expander-balls are used elastic materials (eg rubber), and cocoons are, in fact, a conventional metal spring. These shells are perfect not only to strengthen the muscles of the hands, but also for the more active blood circulation, and even for the prevention of various diseases of blood vessels and joints. http://soundcloudcommunity.org/exoslim/
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