It’s a Woven mesh coated with PVC. Fiberglass screening is Flexible, economical and easy to install screening. It will not crease, dent or unravel. Fiberglass mesh is also more opaque than aluminum mesh, allowing for greater visibility. Its attractive appearance and easy installation allows for a wide variety of applications – including windows, doors, porches, gazebos and screen rooms – while maintaining an appropriate level of air transfer. Fiberglass is the most commonly used screening for new construction.