Adjustable Violin Strings: The toy violin comes with 4 strings. Different strings can be adjusted to tighten or loosen by using the head buttons, and different tensions will produce different sounds. Through finger rhythm, children can distinguish scales and improve their listening clarity. Safe Materials: The children's violin is made of high-quality ABS eco-friendly material to ensure the safety of the child. 。 If you have any questions or are dissatisfied with our toy violin, please contact us, and we will do our best to provide you with the most satisfactory solution. Portable toy violin: The toy violin is powered by 3*1.5V AA batteries (not included), its dimensions are 15.7×5.7×2.5inch, and it weighs 0.77 pounds. Best Toy: The toy violin instrument allows children to enjoy wonderful music, making it an excellent musical toy for children and violin beginners.