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The Exotek XRAY X1 48P Composite Gear Diff Spur Gear is an optional upgrade for the XRAY X1/X12 gear diffs. This spur gear is more durable than the stock 64 pitch gears, especially needed in open wheel F1 and out door race settings. This spur gear is made from black acetal (delrin) and CNC machined for ultimate trueness. A direct fit with the stock hardware for easy installation.