Round Head Closed 125KHz LF RFID Silicone Wristbands are ISO11784/11785 and 125-134.2KHz frequency band rfid wristband.It widely use for swimming pool ,spa clubs ,door control access ,identification ,etc .Round wristband head and closed strap will durable for wearing and waterproof. Customer logo printing , serial number , barcode and optional size are available .Normally 45mm diameter will fit for children , 55mm and 65mm size will fit for women and 74mm diameter will fit for men's wrists