13.56Mhz HF Prelam or Inlay sheet is composed of HF ICs and aluminium antenna or copper coil for options .It has prelam sheet and inlay 2 kinds of type can be HF frequency in different application .We produce HF Cards can use prelam or inlay both but only can use inlay for HF sticker and HF label . Normally copper coil will better in electric conductivity and aluminium antenna with flip chip technique will quick lead-time .Zhixin can offer customer different options in detailed application.