... fiber led fashion shoelace1. Light principle:LED fiber optic light shoelace, super bright LED lights through the transparent optical fiber, ... bought from detail stores or supermarkets 2. Battery life:Shoelace flashing light mode: long bright flash,slow flash continuous ... optical fiber, and better quality than the EL luminescent shoelace, glow shoelace fiber can withstand the pull of 30-50KG, 50KG ...