Features Package Quantity: you will get 8 fluorescent sticky balls in 4 different colors, namely pink, yellow, blue, green, 2 for each color; Different colors light up the night, it is convenient for the family to play together, which is helpful to relieve physical and mental stress and can be ideal birthday and holiday gifts Product Features: when the decompression balls are received, because the packaged products have not been exposed to light during long term transportation, first of all, the sticky balls need to be exposed to sunlight and purple light for a period of time; When the decompression balls absorb some light, they will glow in the dark, bring you a lot of fun Product Size: each ball is the same size, about 1.8 inches/ 4.5 cm, suitable for grip and help relieve pressure; To prevent accidents such as swallowing, children should use it under adult supervision; Parents and children play together and enjoy happy parent child time Soft Material: quality thermoplastic material