Each is unique and a more pleasant sound than the doorbell.

Door bells are so 20th century! If you want to really announce your presence today, you could be saving a wee bit of electricity and pounding on someone's door with a Stone Door Knocker ($72). This unique door knocker is handmade in Sonoma County, California by the design team of Nerio Festa and Heidi Hummler and features a one-of-a-kind natural river rock on a stainless steel back plate. Great for a bathroom door or office cubicle entrance as well. (via Michael Kiely)

nevr seen before!!

They'll think you are off your knocker when you tie a rock to your door...but that is why I love it

you can actually hear a sound clip when you visit the site.

"Let your sense of design and affection for nature be the first thing guests experience when they arrive at your home. This door knocker charmingly lets visitors alert you of their presence the old fashioned way. The design team of Nerio Festa and Heidi Hummler incorporates natural components into their creations and crafts them using a minimal amount of electricity. Their rock door knocker is handmade in Sonoma County, California. " (via uncommongoods.com)

Let your sense of design and affection for nature be the first thing guests experience when they arrive at your home. This door knocker charmingly lets visitors alert you of their presence the old fashioned way. The design team of Nerio Festa and Heidi Hummler incorporates natural components into their creations and crafts them using a minimal amount of electricity. Their rock door knocker is handmade in Sonoma County, California.

I love how this door knocker mixes a natural rock and industrial chrome. It is crafted by Nerio Festa and Heidi Hummler who design objects with minimal electricity in Sonoma County, California. This is unique and interesting, and an art piece in itself.