This is a shoulder rest made in the Netherlands. For 4/4 violin: Reference price 6,600 yen From the website: Wolf's Forte Primo allows you to freely adjust the metal plate to fit your body type and preferences. You can bend it freely by hand, and with continued use, it will naturally conform to your body shape. The plate shape differs from its sister product, Forte Second. The last two photos are from the website to show how it looks when attached. The actual photos are up to the 9th image.