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 Suspension Arms Compatible with Arrma Series ARA4215V3 1/8 INFRACTION 4WD MEGA RESTO-MOD TRUCK RTR ARA4315V3 1/8 INFRACTION 4X4 3S BLX 4WD ALL-ROAD STREET BASH RESTO-MOD TRUCK RTR ARA4319V3 1/8 VENDETTA 4WD 3S BLX BRUSHLESS ALL-ROAD SPEED BASH RACER