Pitch accuracy: Standard pitch A=442Hz; each note is tuned to fall between -10 cents and +20 cents of the standard pitch. (*Cent is a unit of 1/100 of a semitone) Notice: This product does not display the ST Mark established by the Japan Toy Association. This is because it is extremely difficult for this product to pass the "drop test," a test item added to the toy safety standards, without being damaged by the specifications of this product. Of course, we use safe materials and paints for our products, but please be careful not to drop them and play with them safely and enjoyably. Note: This product is made of natural wood, so the grain pattern of the wood may vary from one piece to another. The product may also contain knots, but these are not abnormalities or defects in the processing.