| 摘要 |
An elastic spherical hand muscle developer is constructed having an elastic spherical body formed of an inner layer and an outer layer, an air chamber defined within the spherical body and surrounded by the inner layer, an air valve embedded in the spherical body and adapted for pumping air into the air chamber, and at least one handle formed of a part of the inner layer and outer layer of the spherical body, each handle defining a through hole for the insertion of the hand.
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