The ProBead PVCu 50mm Ventilation Bead is designed to provide optimal and efficient ventilation by effectively managing the extraction of moisture from air circulation and condensation. In addition to maintaining proper airflow, this ventilation angle also serves as a barrier, preventing small animals from entering the ventilation level, ensuring a secure and well-ventilated space. Each length is 2.5m and available in White. Sold in single lengths only.