the exterior dryer lint trap is designed with dimensions of about 15.35 x 9.84 inches/ 39 x 25 cm, making it fit for about 4 inches diameter vent ducts, vent elbows and hoods; Its Perfect size ensures easy installation and a snug fit, preventing lint from escaping into your outdoor surroundings, please take measurements before buying Design updated: Made of polyester. The opening of the bags is with loop strips which will help you quickly put these vent bags on or off the vent rain cover. Convenient to use: No other items such as string, clamp, magnets, wire or screw will be needed if you use our vent cover bags. The hook and loop fasteners would do the job. Application: Eliminate the problem of birds' nests or dryer lint dust. The lint bags can not only catch the lint but also allow proper venting. Colour:black Material:Polyester Package Contents: 6 x Exterior dryer lint trap 6 x Touch fasteners Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.