P-MD16 is UHF RFID on metal PCB tag, which can be used for Tool tracking ,molding and expensive electronic devices tracking solution. with 4 meters read range using fixed reader. Round shape in size dia 16mm,thickness in 3.0mm ,with 2 holes in diameter 2mm ,with Impinj M4QT EPC memory can up to 128 bits ,user 512 bits ,which the data retention can up to 50 years ,write cycles more than100000 times.