solar system stress balls cover , Earth, Moon, Mars, Mercury, , , Jupiter, and . Each ball comes with realistic patterns and corresponding name. All of stress balls are made of high- material, nontoxic and odorless, advanced printing technique adpoted, clear patterns without fading and discoloring, skin-friendly and allergy-free, child safe. solar system balls come with a moderate pressure, super comfy to squeeze, no extra effort need. You will feel a significant of air when squeezing. squeeze balls are in perfect sizes, suited for all age groups. You will 10PCS solar system balls (covering 8 planets in the solar system plus the and the Moon, 1PCS per kind, the is 3 inches in diameter and other balls are all 2.5 inches in diameter). color: Material:PU Package Contents: 10 x Solar System Stress Balls Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.