Skate Wheel gravity type - This type of conveyor is lighter in weight and a more economical alternative to the gravity roller conveyor. They are used in areas where their lighter weight makes it easily moveable and reconfigurable. As a rule, Skate wheel conveyors are used for smooth bottom, wood, fiber or plastic containers. They are not recommended for handling open bottom crates, cleated containers or damp, soft soggy cartons, flexible fill bags or articles too small to span at least three rows of wheels. Curved sections are also available.