Percussion Instrument, Wooden Bars Hit With Sticks
Puzzle 8 of Alliteration Piece of Cake Pack
Question is: Percussion Instrument, Wooden Bars Hit With Sticks
and the answer is: XYLOPHONE
Word Meaning:
XYLOPHONE — (music) Any musical instrument (percussion idiophone) made of wooden slats graduated so as to make the sounds of the scale when struck with a small drumstick-like mallet; the standard Western concert xylophone or one of its derivatives.
Definitions from Wiktionary.