A much stronger duct tape with cloth backing. This is the ideal product for fixing builders film. The tape does not stretch making it easiest and more efficient to use. The reason for builders film is to create waterproof membranes. The right tape is critical to the film performing to specification. This tape applied correctly is one of the few that allows this. A critical product to use especially when water resistance is vital. Most commonly used with the heavier duty orange builders film.