Hello dear sir We are TURALI GROUP from TURKEY . How are you ? we need piezo ring and tranducer . Ring size 4000 khz OD:50 Wall thickness : 5 or 6 mm . 500 pcs Tranducer 2000 khz tranducer : 20 setwithout horn 4000 khz tranducer : 80 set without horn thanks for reaply