Purchased on Amazon in 2019 for 4280 yen. Selling due to moving. It has been used, but I think it works without any problems. Brand: TOKYU SPORTS OASIS Material: PP, Vinyl, PVC Color: Blue Size: [Ball] Maximum diameter 65cm (980g), [Ring] (Inner) 34cm (Outer) 50cm (800g) *Due to the nature of the material, it will not inflate to the maximum diameter (65cm) at once. If you want to use it at the maximum diameter, please inflate it slowly over time (about 5 times every hour). Material: [Ball] Vinyl chloride (PVC), [Ring] Vinyl chloride (PVC), [Hand pump] PP, Steel Weight Capacity: 300kg Accessories: Balance ball, ball fixing ring, hand pump (not double action), plug remover, plugs (for ball x2, for ring x2) There is no instruction manual. Everything in the photos is included. Regarding the size of the ring, there will be some space for a 65cm ball, but this is the specification. Type: Balance ball