This is a replacement 30-tooth steel idler gear for the Magnum 272 transmission.Replacement part for these models:Bandit® VXLBandit®BIGFOOT® No. 1 Officially Licensed ReplicaBigfoot® Officially Licensed ReplicaFord® F-150 RaptorRustler® VXLRustler®Slash 2WD Unassembled KitSlashStampede® VXLStampede®..