Need to absorb light or sunlight more than 15 minutes, and then they can glow in the dark for about 5 hours; Suitable for all tire sizes; In the picture, that is a 10" tire which is decorated with 12pcs of stickers; 2 tires 4 sides need 48 pieces; Do not wax the car a week before decorating, otherwise the stickers can not fix stably; Do not clean the car until 3 days after sticking.