DE Racing lightweight differential inserts
DE Racing have introduced these lightweight differential inserts for both the Team Durango DNX408 and Losi 8ight line of 1/8th scale vehicles when equipped with Losi heavy-duty differential cases. These inserts remove up to 16 grams of rotating mass from the drive-line, allowing faster acceleration and greater efficiency. A pack contains 12 inserts to convert 3 differentials.
Source: DE Racing [deracing.net]