The Samix SCX10 III Brass Differential Cover features a 5 gram internal insert that can be added to tune the unsprung weight within 47 or 52 grams. Machined from quality brass, this cover will help lower the center of gravity, and the black finish with gold accents will provide a custom look. Features: Adjustable brass weight system Machined from brass with a black finish Adds 47g or 52g of total weight to the axle Use on front or rear Increases durability and strength over stock Laser engraved highlights