Advanced material: quality silicone material, soft and elastic, non-toxic and harmless; The decompression ball is soft and will not harm the user Nice performance: with silicone jacket, easy to clean; After use, the surface will absorb some dust, the viscosity will decrease, and the viscosity will recover after washing with water Scope of application: very suitable for use in the classroom, home or office, very suitable for teachers, students and anyone else; For stressed employees and frustrated teenagers, they are an ideal tool to relieve stress Note: if the ball you receive will not glow in the dark, please rest assured that it is not a bad ball; Please place the ball in a place with a light source, so that the ball can absorb 3-5 minutes, such as sunlight or electric light