Abundant Quantity and Color: The pack contains 12 pieces of pressure enough for you to use or replace in your daily life Good performance: with silicone cover, easy to clean; after use, the surface will absorb some dust, the viscosity will decrease, and the viscosity will recover after washing with water Advanced Material: These glowing balls are made of high quality TPR material, soft and elastic, non-toxic and harmless; the pressure relief ball is soft and will not harm the user Tips: If the ball you received will not glow in the dark, please rest assured, it is not a bad ball; please put the ball in a place with a light source, let the ball absorb 3-5 minutes, such as sunlight or electric light VERSATILE APPLICATIONS: Ideal for use in the classroom, home or office, great for teachers, students and anyone else; ideal for stress relief for stressed employees and frustrated teens feature: Product performance: They help adults and teens relieve stress and anxiety at work or school. The stress-relief ball is soft and safe and enhances the emotional connection of the family. This is a fun relaxing and entertaining toy. TPR is wrapped with silicone material, which is non-toxic and safe. Product introduction: 12 Glowing Stress Balls (random color) notes: To glow, please place the ball where there is a light source, let the ball absorb for 3-5 minutes, such as under sunlight or electric light, and then glow in the dark. Washable, easy to clean surface. There will be dust on the surface, causing the viscosity to decrease, but the ball will become sticky back when rinsed with water. Due to manual measurement, please allow a slight deviation in size. There may be slight color difference due to different monitors and lighting effects.