Aside from the great looks, aluminum alloy will not flex as much as plastic under stress or during high ambient temperatures. The lightweight aluminum alloy material is durable and improves the overall performance of the HD CHASSIS BRACE SET.Compatible with Arrma Series ARA106040, 1/8 KRATON 6S BLX 4WD BRUSHLESS SPEED MONSTER TRUCK WITH SPEKTRUM RTR ARA106044,1/8 NOTORIOUS 6S BLX 4WD BRUSHLESS CLASSIC STUNT TRUCK WITH SPEKTRUM RTR ARA8611V5,1/8 NOTORIOUS 6S V5 4WD BLX STUNT TRUCK WITH SPEKTRUM FIRMA RTR ARA106060,1/8 OUTCAST 6S BLX 4WD BRUSHLESS STUNT TRUCK RTR, 10TH ANNIVERSARY LIMITED ARA106042,1/8 OUTCAST 6S BLX 4WD BRUSHLESS STUNT TRUCK WITH SPEKTRUM RTR ARA8306, 1/8 TLR TUNED TYPHON 4WD ROLLER BUGGY ARA106046,1/8 TYPHON 6S BLX 4WD BRUSHLESS BUGGY WITH SPEKTRUM RTR ARA8606V5,1/8 TYPHON 6S V5 4WD BLX BUGGY WITH SPEKTRUM FIRMA RTR