Welcome to Romala Industry & Trading Co., Ltd. (Romala) - a leading producer of color-changing technical products. We are a Hong Kong based company and have a factory in mainland China. Romala mainly specializes in producing, researching, developing and selling color-changing technical products, such as heat sensitive, cold sensitive and light sensitive color-changing mugs. Our products have magical characters when they meet hot / cold water or drinking, and your own logo shall appear on the mugs magically. They look very charming and attractive. We believe that you will be interested in those special products when you have a glance at them for the first time. Our mugs are good choices for promotion in your store, supermarket, and other places. Moreover, they are high quality gifts for your employees and friends when festival is coming. Based on the principle of "Customer is our god,