Dense Piston

This piston is crafted in the same way as a regular piston, but iron blocks are used instead of cobblestone. A sticky variant exists.

It works the same way as a conventional piston with a few differences:

It can conduct redstone power, even when the piston is extended. However, the dense piston cannot be pushed or pulled by any other piston. One of its uses is it allows bigger piston doors to be used in more confined areas.