Pemko 18061DNB48 48" Door Sweep. Dark Bronze Anodized extruded aluminum body with Black nylon brush. All Pemko brush sweeps consist of dense type 6 nylon bristles. These gasketing products will conform to irregular surfaces making it an excellent product to seal almost any opening using a minimal closing force. They are moisture resistant and retain insecticides well. These door sweeps have a temperature range -40F to 160F. The brush portion extends 5/8" below the extruded aluminum base. Screw holes are slotted for adjustment.