Pemko Door Bottom Sweep, Clear Anodized Aluminum with 1" Gray Nylon Brush insert, 0.25"W x 1.875" H x 36" L All clear anodized brush products are supplied with gray brush (available with black brush upon request). Other finishes supplied with black brush. All brush seals greatly reduce the infiltration of light, air, wind, rain, and snow; prevent heat loss; control the penetration of smoke and fumes. Brush remains flexible down to -40F and has a melting point above 400F. UV stabilized, dependable, long-lasting, cost-effective. Nylon brush insert is designated by a undefinedNBundefined following the finish code.