The Riiflex are ergonomic, gym-quality weights that cleverly fit with the Wiimotes. Each weight is made of polycarbonate, cast-iron, and has a soft-touch rubber overmold that prevents the weights from falling out of a person’s hand.
The Riiflex weights can be used with the Wii Fit Plus, Fitness Ultimatum, Golds Gym Cardio, My Fitness Coach, and EA Sports Active. The weights are also compatible with Wii Motion plus. It will likely take time before Riiflex offers heavier weights. For now, two pounds are the heaviest.