This is a Wolf shoulder rest. I really liked using this for a while, and this is the second one I bought after the first one wore out. This one hasn't been used for very long, and there's not much wear and tear on the sponge or deterioration of the rubber. You can use it right away. I think the rubber is still in good condition and doesn't need to be replaced yet. This patented shoulder rest is adjustable in height and is compatible with 3/4-4/4 size (full size) violins. It's a Dutch brand. WOLF Forte Second The shoulder rest part can be freely deformed, and you can adjust its shape to fit your body type and playing style, as well as adjust the height. I think it's easy to fit people with long necks. I think this shoulder rest is suitable for people who don't want to firmly hold their shoulder. The legs will be sent separately. (To make it thinner and prevent damage) Violin Shoulder rest For full size Wolf WOLF