Key benefits - Complete light blockage: White weather stripping with a dark gray foam core blocks light around the door, improving privacy and reducing light intrusion. Please ensure your door jamb has a groove for kerf-style weather stripping installation. - Extra long coverage: 40 feet of sealing material provide coverage for various door sizes. The design features a 5/32 inch spine that fits 1/8 inch grooves and seals gaps from 1/4 inch to 1/2 inch. Measure groove size before purchasing to confirm compatibility. - Durable and flexible construction: A rigid PVC flange preserves secure attachment to grooved door frames. The tear-resistant PE cover and high-resilience PU foam deliver long-lasting durability and flexibility, maintaining a consistent seal across temperatures. - Hassle-free installation: No adhesive is needed. Simply measure, cut to length, and insert the flange into the groove for a tight seal that stays in place. Product details - Length: 40 feet - Spine: 5/32 inch - Groove fit: 1/8 inch - Gap sealed: 1/4 inch to 1/2 inch - Materials: PU foam core with PE cover; rigid PVC flange - Color: White - Installation: Kerf-style weather stripping; no adhesive required Compatibility and installation notes - Kerf installation requires a groove in the door jamb. Please verify your door has a kerf groove before purchasing. - Installation steps: measure the door length, cut the strip to size, and insert the PVC flange into the door groove to achieve a tight, durable seal. Use scenarios - Exterior entry door: Improve energy efficiency and block light leakage from outside while maintaining a clean, finished look. - Interior doors for privacy or media rooms: Reduce light bleed and drafts, enhancing comfort in bedrooms or home theaters. - Basements, garages, or utility rooms: Seal gaps around doors to minimize drafts and temperature fluctuations, contributing to overall climate control. This kerf door seal provides a reliable, durable solution for blocking light and drafts on doors with kerf grooves, combining long length, compatible sizing, and a robust construction for consistent performance across temperatures.