Auto Glow In The Dark:These glow absorb and store energy from sunlight or other light sources and light up in dark environments. Glow up to 3-6 hours at night or any other dark environment. Glow In The Dark Stones(artificial):Size about Length:2-3cm / 0.78-1.18inch ,Quantity:300 pcs. Material:No need for battery charging glow , These glow in the dark are light up by solar or LED light. Wide Application:Very suitable for indoor and outdoor decoration, you can use these glow in the dark stones to line up sidewalks, paths or driveways, lay the edges on flower beds, or use these luminous glow stones to fill pot Plants, make DIY decorations for vases, aquariums. Colour:Blue Material:resin Size:2cm Package Contents: 300 x RC Car Glow Rocks Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.