1.yoga ball, gym ball 2.material:eco-friendly & durable pvc 3.size:45-85cm diameter 4.regular or anti-burst quality yoga ball, gym ball, exercise ball.material: durable pvc(normal non-toxic quality, or phthalate/PAHs free quality)size:45-85cm diameter,regular or anti-burst qualityP.S.: can fill with sand inside ball, in order to get better fitness effect.