The Beef Tubes SCX10 II AR44 Differential Cover is machined from solid brass to help add 1.1 ounces of weight down low for improved center of gravity. Plus the material provides more evenly distributed bearing clamp force compared to the stock plastic housing. The covers are drilled and tapped for compatibility with the stock hardware, and the covers can be painted or powder coated whatever color you prefer. Package includes one brass diff cover.