The Volas Ankle Balance Board listing says it builds stronger ankles and lower-leg muscles, enhances balance and coordination, aids recovery and rehabilitation after injury, provides added stability and joint support, and encourages better posture. It is in Electrics.
Those lines are listing copy, not care advice. The first photo is a folding light-wood board with two black pads, not a round wobble disc.
See the Volas board page.