Alpha Concert Ukulele Mahogany Ukeleles Uke Hawaii Guitar comes with the best-geared tuner machine and Aquila sting, makes the ukulele keep in tune when the string settled down, we pre-tuned every ukulele before shipping out to ensure the strings stretch out properly and stay in tune better upon arrival. Round the edge of the ukulele so that you will feel comfortable with your arms. We put a rib into the neck, make it stronger to stay straight all the time. We preset the action to a proper height, to easy your finger when you play this ukulele. This ukulele is set with four nylon strings which bring surprisingly beautiful sound. Because of the special properties of nylon strings, the tone will change affected by temperature and humidity easily. We have tuned before shipment, and it still need to adjust before you start to play. Size : 23-Inch.