BEST BRASS GROOVE 9B GP Cornet Mouthpiece GP... Gold-plated, approximately 24-karat gold. After purchasing the silver model, I had it gold-plated at a workshop. I believe I used it quite carefully. However, since it is a used item... I hope to sell it to someone who understands this. I am very sorry, but... I am not accepting price negotiations, so please refrain from doing so. Thank you very much.