The Barmac S-Series VSI is unique due to its crushing process. Whereas most other types of crusher use metallic parts to crush rock, the Barmac VSI uses the rock fed into the machine to crush itself. This autogenous crushing process produces the best-shaped aggregate on the market today. Feed Tube Crusher Spare Parts Apply To Barmac B6150SE VSI Crusher Accessories Spare Parts. VSI parts Made by high wear-resisting materialhigh chrome cast-iron. We manufacture an extensive range of wear and spare parts in China for the worlds most popular crushing brands.