Black Rubber is the ultimate Slide Out Seal Systems. Can be used for new installations or when upgrading worn out rubber seals. Order in two parts. Base is designed with straight edge for easy alignment w/adhesive backing. Fasteners maybe used to install as well. D Seal, purchased separately, easily slides onto track in base, hides fasteners and provides a positive seal. Black Rubber may also be used on interior wall for protection when Slide Out Room is extended or, when replacing a double seal. Dimensions: 1" x 15/16" x 35