Black Coating Brass Drive Shaft Front Rear Center Shaft for TRX4M 1/18 RC Crawler Defender Metal Upgrade,2PCS 1.Brass materials construction, black coating not easy to rust 2.Enhanced structure design for long-life durability 3.for TRX4M Defender stock ONLY (Note: can not fit for Bronco ,K10 ) 4.weight : 32.8g/2pcs