Maximum Privacy Winged Vertical Inserts - 4 Ft. High-Redwood Flat-tubular body with "legs" inside for extra support Flexible and resilient wing portions are positioned on each side of the slat body Serrations are added to the wings for easier installation and locking power SLAT LENGTH: 2" shorter than overall height of fence PRIVACY FACTOR: Approximately 90%. (Based on wire/mesh used-stretch tension)