Focus on Stringed Instruments,Keyboard and Wood/Brass Winds.  Including Violin,Viola,Cello, Contrabass,Guitar,Bass,Ukulele,Digital Piano,Electronic Organ,Saxophone,Clarinet,Flute, Trumpet,Trombone,Horns and Others .

Aiersi{eye’-er-see} brand is mainly for guitar ,bass ,ukulele and keyboard instruments

 Guitar and ukulele business web

https://www.aiersiguitar.com

https://www.aiersiukulele.com

keyboard instruments

https://www.aiersi.net/

Sinomusik brand is for violin, viola, cello, contrabass and brass/wood wind instruments   

business web https://www.sinomusik.com/