Hahaemall 12FT American Modern Interior Country Steel Brackets Sliding Double Barn Wood Door Hardware Roller Track Garage Set BrandHahaemall condition: New Surface: Black frosted, corrosion protection Material: High quality Steel. Door weight : 150lb - 230lb, Door panel thickness:13/8''and 13/4'. Passed the test of opening - closing: 100000 times. Stopper: Rubber covered, Noise reduction Roller bearing: High purity bearing steel Gcr15 Steel Steel thickness: 6mm , Screws: 8.8 grade. 12FT kit's Package Include: Roller(4) Stopper(4) Sliding track(2pcs*6ft ) connector(10) Anti-pad:(4) Floor guide(2) Installation manual(1); Hardware Only,DOOR NOT INCLUDED. Warranty : 5 years, We provede customized service.any part missed or defectived during shipping, please let us know, we will send replacement at no charge at first time.