team.3. Q:How abou the samples? Is it free to extra fees?A:Free sample is acceptable if you are glad to pay the freight.Advantages1. Anti corrosion and anti rust2. High credit and quality :SGS, ISO9001:2008, DNV3. Professional manufacture and controlOur service commitment: we accept unconditional return for our mistake.We have always abide by the commitments to make your purchase zero risk.