Patent ID: 7736275

Claim:
A wrist exerciser, comprising: a casing comprising upper and lower casing members matting each others to form a hollow sphere, the upper casing member forming a hole; a retention ring interposed between the upper and lower casing members and defining opposite holes; and a rotor having oppositely-extending axles rotatably received in the holes of the retention ring and surrounding wall portions encircling the axles, a cavity being formed between each axle and a surrounding wall portion of the rotor with respective partitions extending therebetween to divide the cavity into a plurality of chambers, holes being defined in the rotor through the surrounding wall portions, the holes being offset from a diametric circumstance of the rotor about the axles to align and be in fluid communication with notches formed at respective edges of the partitions to be in fluid communication with the chambers, the surrounding wall portion of the rotor forming each of the holes directly contacting the wall portion of the partitions forming the notches; whereby a whistling sound is generated during rotor rotation within the casing when said partitions are rotated to create airflow communicating between the notches and the chambers and passing through said holes being offset from a diametric circumstance of the rotor.