RFID Coin Tag,abs tag,with hole,water and dust-proof, used in Security, ... Control, and Patrol checkpoint.... RFIF Coin tag is made of ABS material, and produced by ultrasonic plastic welding or filling epoxy techniquesThe ... resist metal disturbanceKey Features:Dimension: diameter 30, 40, 50mm Housing: ABS, ultrasonic plastic welding; or filling Epoxy Storage temperature: -25 to ...