Welcome to our store Material: High Intensity Luminous Materia Size:8mm*1m ; 8mm* 1.2m Weight: 5g Color: White / Yellow / Green / Blue / Pink Package Included: 1 Pair of Shoeslaces (2pcs) Note: The Green and White shoelaces are a little brighter. The luminous shoelaces only glow in the dark, without power supply. They need to absorb light by sunshine, lamp, flashlight, and even mobile screen. They will glow about 4 – 5 hours after absorbing light for 30 minutes. The stronger light, the better. They can glow again and again and forever!