In June, I received an email from John in Germany saying that they are test tube manufacturers, but their test tube sales have been decreasing in the past six months, and the frequency of purchases by customers is also very unsatisfactory. He wanted to buy a batch of instrument brushes to see if they can increase sales of test tubes.

Our sales customer service, Mary, responded promptly after receiving the customer's mail for 1 minute. John did not know the specific size of the instrument brushes because of the first purchase. Mary learned from John that the commonly used tube sizes are 2mm, 5mm, 10mm, 12mm and lengths from 100mm to 150mm. Mary suggested that John use four sets of brushes. The size of the brush is in accordance with the test tube and the length is recommended to be 150mm-200mm, which makes it easier for customers to clean. John was very pleased with Mary's suggestion and paid a usd90 sample customization fee. After 3 days we sent the samples.

Two days later, John received the instrument brushes, very satisfied, and sent it to some large customers. The feedback from the big customers was very good, and the number of purchases also doubled. John was very happy, saying that he didn't expect the brush help to increase the sales of the test tube and gave us an order of 50,000 pieces.