These are the Samix SCX24 Aluminum and Brass Adjustable Offset 1.0" Beadlock Wheels. Constructed from CNC machined aluminum and brass these wheels offer premium construction while adding additional weight down low helping to lower your crawlers center of gravity. The wheel face and back are constructed from aluminum and anodized to provide a durable great looking finish, while the inner beadlock ring is constructed from brass providing the most additional weight possible. Included with these wheels are four shims used to tune the wheel offset, giving you the ability to create the custom look your searching for.