Stepping up in class, is the ALPS 50lb. roller guides. The 50lb. roller guides are precisely CNC machined from 6061 T-6 marine grade billet aluminum. The ALPS 50lb. roller guides are not only strong but extreme corrosion proof. All other critical parts including the screws, axle pin, and rollers, are SS316 stainless steel, providing extreme corrosion resistance. ALPS assures each axle pin has a custom teflon bushing to reduce friction and allow unparalleled roller performance.