I bought them for the Quality. The lock is a nice bonus. Ive heard many low-cost audio brands and only two sound GREAT: Tribit and QCY. It looks great and it was very easy to install. Ordered a size 6. All of my previous earbuds have exhibited some types of tech issues over time. A CHARGER being sold for $40 doesnt even come full package, I have to personally assemble these pieces to use it. Youll very quickly get an idea of what the ear drum looks like. 3 years of mild use the screws backed out and fell out. Old school methods to rapidly increase strength and muscle mass!