... 5.OEM factory led Description Optical fiber led lighting shoelace1. Light principle:LED fiber optic light shoelace ... luminescent shoelace, glow shoelace fiber can withstand the pull of 30-50KG, 50KG will reach the deformation ... is better than the EL luminescent shoelace pull ,30-50KG,50KG will reach the deformation will ... of light, EL can only afford 3.5KG pull, very easy to damage if more than tension, ...