Armstrong Ceilings Silhouette HD White 20 Pack 144 in Galvanized Steel Ceiling Grid Main Beam plank Vinyl flooring check fluid levels check fluid levels deep finished with a white 144 in x 9 16 in x 1 3 4 in 12 LFT Heavy Duty Main Beam Notched 24 in On Center Rotary stitched during manufacturing by a patented method for additional torsional strength and extra stability during installation Hot dipped galvanized coating inhibits red rusting better than electrogalvanized or painted systems 240 linear ft per carton (20 pieces per carton) Suspension system 10 year limited warranty 5625 Material Galvanized steel Rust Resistant Yes Package Quantity 20 Commercial Residential Commercial Residential Color Finish Family White Manufacturer Color Finish White Warranty 10 year limited UNSPSC 30161600 CA Residents: Prop 65 Warning(s) No