Elecom HCF-BBDMGY Balance Ball, 17.7 inches (45 cm), Eclear Sports Donut Type, Medium, No Rolling, Pump Included, Gray

This is an eclea sports donut type balance ball that allows you to train your core at any time just by sitting
It allows for a wide range of exercises from simple training to applied training and stretching
Donut shape for stable sitting
Anti-burst specifications to prevent bursting
It does not roll around so it won’t get in the way in the room