Used for about a month with a 100-yen cushion cover. Using a cushion cover makes it less like exercise equipment and blends in with the interior. Easy core training just by sitting! Recommended as it takes up less space than a balance ball. Commercially available cushion covers (45 x 45cm) can be used. ELECOM Balance Cushion Seat Cushion Weight capacity: 120kg Square type ECLEAR SPORTS HCF-BBSGY With air pump - Brand: ELECOM - Model Name: ECLEAR Square Balance Cushion - Size: Approximately 46cm x 36cm x 8cm - Color: Gray (Flat Type) - Material: Polyvinyl chloride (PVC)