Painted steel track; steel top pivot brackets are pre-installed to track; steel bottom pivot brackets; brass plated steel hinges; roller guides and pivots have a 7/16" diameter plastic base with steel pins; steel spring snugger with plastic retainer sleeve; zinc plated steel aligners; unfinished wood knobs. Track length is pre-cut to slightly less than opening size to minimize the need to cut the track; use with wood door panels 1" to 1-3/8" thick. For use on doors weighing up to 30lbs each.