1.Fiber optic led light up shoelace 2.Material: TPU,ABS,LED ... 5.OEM factory led Description Optical fiber led light up shoelace1. Light principle:LED fiber optic light shoelace, ... transparent optical fiber, makes the whole shoelace body light up, Each shoelace is operated by CR2032 button batteries, ... -50KG, 50KG will reach the deformation will not pull off, but will not affect the effectiveness and use ...