The trademark steel seal and the drum body and drum skin are all printed with the logo. The identification methods of Yamaha Thor drum set include inspection, weight, listening and other methods. The world-famous brand YAMAHA was founded in 1887. It has 130 years of musical instrument manufacturer, 50 years of experience in drum making, and 27 years of innovative design of electronic drums. Every process from design, material selection, processing and testing is checked and inspected by experienced craftsmen.