For research. 3 MHz to 13 MHz Waterproof Transducer/Transmitter Round flat or rod type preferred. Please present minimum size order and price each. Please also supply me with quantity order prices and availability with production capacity. Thank you in advance for your time. Sincerely, David B. Allen Company Name: Allen Marketing Street Address: P. O. Box 550 City: Ponderay Province/State: Idaho Country/Region: United States Zip: 83852 Telephone: 1-208-5970696