This tubular side step is constructed of 4" steel or aluminum. The design provides a larger stepping surface to ensure safety for everyone who uses it. Molded plastic step pads provide non-skid stepping areas that are both durable and dependable, so you can step into your vehicle with confidence and security. The 4" oval nerf bars also feature hidden but sturdy steel bracing. The mounting brackets are coated to help prevent rust and keep the tubes strong as ever. The 4" oval stainless steel step bars are custom fitted for each vehicle to eliminate drilling for installation.