Absolutely Safe Material: 4.5cm.It is made of high-quality rubber material, which is absolutely safe for human health. Dont worry about it hurting you or your children.gobbles fidget balls. Repeated Use Life: The high-quality material absolutely guarantees that the product has a long service life. This sticky ball that glows in the dark has super stickiness and can stick to the ceiling or wall. When you find that the stickiness is insufficient , It can be restored as new by washing with water.They can also be used as glow in the dark party supplies. Glow In The Dark: This sticky ball can absorb light, whether it is sunlight, light or flashlight light, it can absorb and store it, and then put her in the dark, it will emit a beautiful light. Super Playable: Different from the general squish ball, our squish ball has super resistance to tearing resistance, no matter how you pinch it or throw it on the ceiling, wall or floor, can it not bad.They can also be used as party favors. Ideal Gift: Glow in the dark ceiling balls is very suitable as a gift to your children, friends, relatives or to yourself. It can relieve your anxiety and stress well, and is suitable for people with autism and anxiety People with disease have very good physiotherapy effects.