All of them are designed to seal something. They are made out of a material called EPDM, which is UV stabilisied, Ozone resistant material.
They have a huge service life of 10-15 years and work in temperatures from minus 55 degrees to plus 130 degrees centigrade.
It is a good all round product that comes in many shapes and sizes. The application is only limited by people's imagination. It can be used for a number of industries and various applications.
For example, the sponge extrusions can be used for concreting, building, automotive machines and the glazing industries. If something needs to be sealed it will do the job.