Planetary stress balls made of high quality Polyurethane. The stress balls have a highly elastic soft foam core. The stress-resistant balls are durable.The surface of the planet has vivid and clear patterns and vibrant colours based on the real characteristics of the planets. As models of the solar system, the planets can be used as educational toys or astronomical gifts. As children's imaginative minds are more developed, these planets help them to build up a concrete and visual image of the solar system in their minds.The special material makes the compression balls delicately soft and squeezable. Surprisingly, the deformed planets slowly regain themselves. The process of squeezing the anti-stress ball is a great way of releasing stress from school, work and life and creating a sense of comfort.size: 6.3cm diameterMaterial: Polyurethanecolour: as shownPackage Contents:9 x Planet Bouncy BallOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.