This is a set of four hard anodized aluminum suspension pivot balls for the Traxxas Revo monster trucks. These trick, hard-anodized 7075-T6 aluminum pivot balls are considerably lighter than the stock steel pivot balls.The hard-anodized pivot balls feature a special Teflon® coating that reduces friction to make the suspension arms pivot as smooth as possible. The pivot balls are sold in 4-packs that include 4 molded bushing caps. Each package of 4 pivot balls will reduce the vehicle’s weight by 19-grams. Two packages will remove over 1-ounce of unsprung weight!