Product details:

Vertical Track, Includes Lock Cut -Out and Holes for Standard Angle/Bracket Attachments, Type Galvanized Steel, For Use With Garage Doors 8 ft. High, Fits 2 RollersWARNING: California ResidentsThis product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm.