Carbon Steel & Chrome Plating Our home gym machine is constructed from Q235 steel with a 2 in × 2 in frame and 1.5 mm thickness. This construction is suitable for various training routines. The surface of the steel components is treated with a chrome plating process, keeping your workout machine looking its good over time. PU Pulley System Our weight machines for home gym features an upgraded pulley system with PU cables constructed from 7×19 steel wire. The pulleys are crafted from PU material and include rolling bearings for smooth movement and low noise during operation. Enjoy a seamless workout experience whether engaging in high-intensity training or daily workouts.