Features: Sturdy Aluminum Construction: Made from robust aluminum alloy for increased strength and durability, these pulleys handle intense workouts without warping or breaking, outperforming plastic alternatives for long term gym use. Smooth Bearing Function: Built in sealed metal bearings secure consistent cable motion without sticking, providing stable resistance for effective muscle activation and joint friendly training. Quiet Sealed Bearing Design: Features noise reducing sealed bearings to minimize squeaks and friction sounds, ideal for home gyms, garages, or shared exercise areas. Polished U Shaped Cable Guide: The refined U shaped channel securely directs cables while reducing wear, helping preserve your workout equipment. 90mm Standard Size for Wide Compatibility: Fits various gym machines including cable stations, power racks, and trainers, making replacements easy for upgrades or maintenance. Specifications: Substance: aluminum alloy Product size: diameter 88mm (particulars as shown) Functional features: constructed of aluminum alloy, strong load-bearing and bending resistance, say goodbye to easily cracked and fragile plastic pulleys Package Includes: Pulleyx4 note: Pay attention to the storage methods.