16', Black, Garage Door Bottom, Cellular Rubber, An Insulating Door Seal That Cushions Shock As Garage Door Is Closed, Seals Out Moisture & Weather. Nail-on, cellular rubber cushions shock as garage door is closed, seals out moisture & weather, compensates for uneven concrete floor or uneven doors. Nail On Hard Rubber Seals And Cushions Overhead Garage Doors Designed to Compensate For Uneven Concrete