materials: 4 or 4 electric violins are made of materials, all made of solid wood by hand. The wood body produces a brighter sound. The fingerboard ensures play, while the sturdy wood, nails and chin rest are durable and suitable for long-term practice.Ingenious details: The refined piano code is exquisitely crafted and sound sensitive. 4 sound pins, which can be adjusted to the best pitch according to your preferences. The power supply can adjust the volume, and the sound is real and natural.Mute practice and solo power amplifier: as long as you plug in the headphones freely, you can play the electric violin without disturbing others. By connecting to the amplifier through the output jack, you can show your talents at parties or . If the headset is damaged, please .Full size: The silent violin is suitable for students, adults, beginners and advanced players. and portable, it is unlikely to cause fatigue and soreness of athletes' arms to long-term practice.colour: blackMaterial: solid woodPackage Contents:1 x electric violin(without 9V battery)1 x earphone1 x Rosin1 x audio cable1 x piano bow1 x backpackOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.