This product is very useful to keep off insects like cockroaches, lizards etc entering the room. It also act as an effective shield against dust and sound and can be used in ac rooms to seal the air passage under the doors. In bathrooms also it can be used effectively to prevent water draining under the bath room door.Plus points I noticed: Good quality silicon tape with one side gummed portion (red) to paste it on the door. The gum is good and sticks well.You have to be careful in peeling off the protective layer on the gummed portion and align the tape properly at door bottom before pressing it to paste it . Works nice on my wooden doors and sintex bath room door also.Negative side is it is a bit costly item, however worth the price as it is good quality product. I am fully satisfied with the product.For external doors, it is better to fix it at the outside portion of the door and for bathroom doors, fit it at the inside portion to prevent water influx under the door.