With the API Specification Q1 issued by the American Petroleum Institution, Letone also obtained the certificate of Authority to use the Official API Monogram of API 7K and API 16C, certificate of Product Design Assessment, Manufacture Assessment and ABS type Approval issued by American Bureau of Shipping (API 7K & API 16C). Featured as high pressure, full flow, lightweight and long service life, Letone petroleum drilling hoses are widely used in inland and offshore petroleum drilling projects.