Trekline Motorsport's Strut Spacers are made from a Heavy Duty Steel and then powdercoated for the ultimate protection from corrosion and rust. These strut spacers are placed on top of the vehicle's strut and this added height is where the lift comes from. Please note, the spacer thickness does NOT equal the amount of lift. There is about a 1:2 ratio between spacer thickness and the lift height achieved. For example: a spacer measuring 1.5" thick will provide 3" of lift.