describe Dam dimensions: 100x 3 x 5 cm. It can be easily cut to the length you need. The long, flexible design creates a variety of shapes. Shower barriers retention systems keep water within the threshold. Ideal for overflow showers other areas that need to hold water. If you have any questions about the collapsible dam, please contact us. Customer Note: To make the product more stable, please follow the installation instructions to install the water retention strip. Installation steps precautions: (1) First, please clean the floor thoroughly keep it dry. This step is very important! (2) Next, determine the installation position of the water retaining strip, then make a mark on the floor with a pen. (3) Tear off the adhesive tape on the back of the water retaining strip stick it on the floor according to the position shown before. (4) Then fill the area where the two ends of the tape contact the wall with glue, seal it, remove the excess glue to make the contact smooth. (5) Finally, to avoid falling off, please dry it within 24 hours avoid contact with water.