Guangzhou Chongyu Engineering Materials Scientific Co., Ltd. was set up in 1987. Thanks to the common desire of our staff members, we have developed into a large-scale group which has factories both in Taiwan Area and Mainland China. Our headquarters is located in Taipei City and we have several branches in Guangzhou, Dongguan, and Wenzhou cities. During the passed 20 years, operated with success, Chongyu has become one of the most excellent suppliers in the promotional electronic & advertising gifts in China. Generally speaking, our main products can be classified into 5 different lines. 1. Promotional electronic gifts 2. Photochromic products which change color when meet UV light outside 3. Thermochromic products which change color when meet hot or cold moisture and body temperature or hand touch 4. Long term glow in dark items 5. Long term smell sensitive products Eac
