Modifying products and selling them

I am a product designer. I got an offer from a company. The new company buys good from China, modify the logo, colour, etc. and sell it in the European market. Among the things they buy mostly, are speakers, mobile phone accessories, and also musical instruments that include a guitar, or a drumkit.

My job is to suggest a colour and finish to the goods if required. Apart from that, the core business of the company is - it manufactures audio speakers (its own) and also synthesizers, guitar distortion units, and mixers. However I will not have anything to do with the core business department. My department is only concerned with sourcing goods from China, modifying it a little if required and selling it. Kindly give me your opinion if it is halaal or haraam.