1 used for sliding door 2 to seal the gaps between 2 frames 3 to ... , insect, dust ... 4 good magnetism, stickiness 1 big pc + 1 small pc = 1 set.Packing: 2m/pc ( 2.2m/pc, 2 ... , 2.6m/pc available); 2 pc/set; 100 set/cartonSuitable for the aluminium without groove, or the 13mm base width aluminium ... forward to your inquiry, thank you. MAGNETIC COUPLED SEAL STRIP FOR SLIDING DOOR