I ordered a size 7, which is what I wear in most other brands. The JUJ ANC Earphones are one of the best earphone values on the market! I used a 15cm USB C cable with the BTR5 on the back of my phone but the cable and plugs do get in the way. Jadore ! No rather an upgrade on the product you are returning or a discount or something. It all turned out to be quick and easy to install. 7 is perfect. After reading the reviews, and hearing people say that this product runs small I did listen, and got two sizes bigger. Who cares if logitech mice seem to break often when their support will promptly send you a replacement. The beads themselves are decent, for the most part, as is the case.