... have patent certificate of this LED fiber optic caps in china.LED Light cap,flashing cap,fiber optic cap,flashing logo caps, lighting logo ... hats,LED promotional capsWe have patent certificate of this LED fiber optic caps in china.1) Cap details:Fabric: 100% cottonAll fabric ... ,blue,green,orange,purple,yellow and so on) 3) Velcro closure can adjust the size of the caps, it can be ...