The factory upper control arms have weak ball joints and stamped steel construction that is not designed to handle off road use. The new Pro Comp Pro Runner Control Arms deliver amazing performance and increased durability for lifted, leveled or stock cars. They are designed from heavy duty chromoly steel tubular with solid 1'' ball joints to withstand extreme overloads of suspiensionfits to Toyota Tacoma 2005 - 2012,heavy duty chromoly construction,solid 1'' "Uniball" ball joints,reinforced joint bushing mounts,zerk dust caps included,black powder coat finish for years of lasting performance,