The keys hold tuning like keys should, but I am on my second set of strings that I change after a month of use, and the bolts on the tuners have come loose, which affects tuning. Additionally, the price is doubled because you have to buy the bass strings if you want to change all the keys on the guitar. Furthermore, they did not come with a case or screws to install them, and for someone who cares about color, the tremble from the bass strings has a slightly different shade. They were delivered wrapped in plastic. Overall, mediocre quality for 40+ euros.