As a customer, I was let down badly by the roughness of the HOYIN brushes. The brushes I ordered were of low quality and did not live up to the company's boasts of its superiority. Unfortunately, the power tools I bought to remove burrs and polish the metal did neither. The costs were also higher than advertised. Overall, HOYIN is not a company I trust to deliver consistent abrasive and finishing goods for use in manufacturing, research, and other professional settings.