A woodblock is a solid rectangle of wood usually sporting rounded off
edges. Lengthwise there is a portion of the block hollowed out about an inch from the top, leaving an
empty space of a half an inch between the block proper and it's top, otherwise known as the
playing surface.
A woodblock is a very
piercing, striking instrument often used to symbolize something like
horses or foot steps. It is struck with a
xylophone mallet.