Fifty (50') Rolls Norco Style Window Kerf Bulb .250 | Beige Seal Weather Strip As Shown Below | Norco Window Sash Weatherstripping - Window Weather Strip Replacement Parts - Double Hung, Single Hung, Casement and Awning Windows - used on some meeting rails, window frames, this is a 1/4" Diameter Special Purpose Compression Seal. Also available in some alternate upgrade styles and model numbers up to the .300 Bulb Diameter.

And in some styles available in White and Black elsewhere on this site.