Portable hand trainer, rejecting ineffective training. Adjustable air valve for finger training. Train any finger to flex and extend freely with the independent switch. i3.1ff35Y8w5Y8wX4" style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px; margin: 0px; padding: 0px; height: 8447.93px; position: absolute; top: 0px; visibility: hidden; width: 1063.12px; z-index: -1;">.
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