I've been using these with my Pony Pipe Clamps for over ten years now. My originals are still working great and have never cracked, hardened or otherwise deteriorated like so many plastic parts do. Hopefully this newest set will perform as well. I recently expanded my pipe clamp collection and wouldn't be without these pads. It saves a lot of time not having to maneuver makeshift blocks between the clamp and the work piece. I've tried a few of the imported clamps and keep coming back to these old standards.