Cargo presentation (gimniki plus) 55 red BRQ) is suitable for maintaining the balance of the ball weighing 300 kg, very tight and active. Working on the ball, turning it or playing with it, you can clearly transfer the body. BRQ (burst resistant quality) is not a rupture, but rather a slow leak of air quality if opened. Japanese ball certification association: this product, as recommended safety and durability in motion, is certified by npo as a legal entity, the Japanese g ball society. This product was certified by a public consortium as a legal entity of the Japan sports research federation. Size: maximum diameter: 55 cm color: red applicable age: 3 years and older, Italy ・ ledra plast manufacture materials: polyvinyl chloride (without the use of a plasticizer like phthalic acid) inflatable pump for sale. Use the notice that the maximum diameter of the product page. Since the material has bearing properties, the ball can only be solid at the beginning of its use, at the first approach to the maximum diameter it can expand. If you want to approach the maximum diameter, use it slowly (1 hour 5 times).