Agooding LED Optical Fiber Bracelet Armband Bangle Glowsticks Pat Circle Made of high density durable nylon + optical fiber + ABS switch box 3 flashing modes: quick flash, slow flash, keeps on light Waterproof, washable, and can be used or about 70 hours Size: S:Width 4cm(1.6 inch) , Length 25cm(9.8 inch) M:Width 4cm(1.5 inch) , Length 35cm(13.8 inch) Perfect for both outdoor activities and parties or festivals