This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
SoundboardBracesRibs. Under the Grand Piano View from below of cm grand piano In order of distance from viewer softwood braces tapered soundboard ribs soundboard The metal rod at lower right is humidity control device From en en Image SoundboardBracesRibs Digital photograph taken by Opus This image is not copyrighted and is hereby