Product Information Material: TPR Size:6cm When sticky small balls absorb some light, they will glow in the dark. If the light from the luminous ball is very weak, please place the viscous ball in a place with a light source, such as sunlight or strong light, and the viscous ball absorbs it for 3-5 minutes. You can put these ceiling balls on a clean and flat surface, such as walls, ceilings, etc., wait for the luminous balls to fall slowly, and then grab them. Please note that sticky balls cannot work on smooth surfaces. Package included: 4PCS Sticky Balls Note Please allow 2-3 cm difference due to manual measurement. Besides different computers display colors differently, the color of the actual item may vary slightly from the below images, thanks for your understanding(1 inch = 2.54 cm) When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it