Also known as the Power Ball or Strength Ball, the LED-based device is aimed at tennis, golf and badminton players, and the name of the game is to strengthen your grip.
Shake to light, and the more you shake the heavier it gets, apparently.
“A limp handshake isn’t the first impression you want someone to have of you. Get yourself one of these amazing Wrist balls and after a few training sessions, you’ll be well on your way to the bone-breaking handshake of your dreams,” writes the Paramounzone website.
“Are you man enough to reach 10,000 RPM?” the site asks.
They’re yours for the bargain price of £7.99.
Watch the video, but no jokes about the man’s wrist action, please.