ニューストンライン 199 バストロンボーン用の買取情報

The product you're referring to appears to be a "Mikami Mute" for a bass trombone from the New Stone Lined series, specifically model number 199. This mute is used by musicians to alter the sound of the instrument, often for practice or specific musical effects.
If you need more detailed information about this product, such as its specifications, features, or where to purchase it, please let me know!