These Schumacher Racing Products chrome steel differential balls are a factory replacement for the Atom and Eclipse platform vehicles. Sold in a pack of 12, they are sized for 1/8 scale differentials and are designed to maintain smooth, consistent diff action. Chrome steel construction provides the hardness and surface finish required for reliable performance in a differential application. Features: Chrome steel construction Pack of 12 balls 1/8 scale differential fitment Compatible with Atom and Eclipse platform builds 7/7/26 cs