Shenzhen Hi-Teachfan Co., Ltd. has been very helpful in getting my company the 12V 5015 ball bearing fans that we needed to make one of our products. Alan Liu from Shenzhen Hi-Teachfan Co., Ltd. was extremely helpful and willing to answer all of the questions that I had and even provided a live tour of the facility. I am very pleased with the quality of the fans and the delivery time as well. I look forward to doing more business with Shenzhen Hi-Teachfan Co., Ltd. in the future!