Light Up Neon LED Shoelaces Flash Party Disco Glow Shoe Laces Shoe Care Strings Size: 840mm x 2.8mm With ordinary battery, it keeps on flashing for about 60-80 hours. It is a waterproof, washable, durable and safe item for children and teenagers. Suitable for any kinds of shoes, including running shoes, boots and skate. Great for parties, night jogging, safety and all kinds of night time fun.