Since las year Vosun first 7075 series release.And got good feedback. But sold out in a short time. For long we got many feedbacks about V4. Some said the shape is something same to others, and some said thats good design and keep going. Discussing with teams, we really want to reproduce the V4 shape. And now the bimetal ring seires is hot and many bimetal yoyo like this shape. But there are all so expensive. For this we make a ring for V4 with 6061. Just a similar out look to bimetal. It plays smooth and good face. Thats how comes new V4-6061 series.