Why is there a line on the Redmi Buds 6?

This line is a mold line, not a crack, and it is a normal occurrence during the manufacturing process. The surface finish of the earbuds is glossy, and the mold line is not visible after proper polishing.
However, over time, dust or dirt can accumulate along the mold line, which can make it more noticeable. To keep the earbuds looking their best, it is recommended to clean the surface with a soft cloth to remove any dust or debris. This will help maintain the earbuds' appearance and ensure optimal performance.

Note:
1. If you feel the middle and back shells of the Redmi Buds 6 are rough, this is a product design and does not affect normal use, so you can use them with confidence;

2. The gap in the charging case is a result of the fit between the upper and lower parts of the case and does not affect the use of the earbuds, so you can use them with confidence.