Material Mono Ball Bearing: NMB (Minebea) Mount Housing: Stainless Steel (SUS303) Effect Driving stability and maneuverability With increased cornering force,the tires move in the correct trajectoryeven when the load on the mount increases.This results in better maneuverability in marginal cornering. Reduced drag Rubber mounts are very frictional because the suspension arms move with the twisting of the rubber. Mono-ball bearing mounts have less actuation resistance than rubber mounts, which improves tire tracking. Durability and Corrosion Resistance Minebea uses the largest possible diameter Minebea bearings to improve durability. The mount housing is stainless steel for high corrosion resistance. Caution Installation of the product may require specialized knowledge and skills, so please ask an experienced factory to install the product. Note on ordering This product is shipped in the order it is ordered, so it may not be able to be shipped immediately even if it is ordered, since it can be ordered even while the product is out of stock. Please feel free to inquire about the delivery date and waiting order.