ELECOM balance ball, 55cm in size, with a dedicated pump, supports up to 500g. The pump is one I purchased separately (the one that came with it was black). - Brand: ELECOM - Model Name: ECLEAR SPORTS Balance Ball - Size: 55cm - Maximum Weight Capacity: 500g - Included: Dedicated pump Although the size is different, I was using it with a separately listed cover. If you purchase it as a set with the balance ball cover, I will sell the set for 3000 yen. I plan to ship it in a paper bag. Thank you.