Acmee High Visibility Soft Nylon Light Up Shoelace with 3 Modes For Night Safety Running Biking, Or Cool Disco Party, Cosplay, Hip-hop Dance (Multi-color, Pack of 1 Pairs) Great for night jogging safety, dancing at clubs and raves, adding fun to sporting events, or standing out in any crowd They can be worn with any laced shoe, boot, or skate Made of glass fiber, these laces are weatherproof, washable, heat resistant, durable, and safe for children and teenagers With ordinary lithium battery, it keeps on flashing for 70 hours Shoelace size: 2.8 * 820 mm