Yes, because if they weren't then they would rot after a couple of rainstorms. Marble is usually what they are made of since it can withstand hard conditions and won't rot or erode away that easily.
There are many different kinds of garden chess sets and most are actually very portable, here is some more information on them: http://www.megachess.com/chessparkdesign.htm
Garden chess sets come in many different types of materials from plastic to wood. It really depends on the preference of the consumer of which type of material is chosen.
Garden chess sets add fun and nostalgia to almost any outdoor setting. Enjoy outmaneuvering competitors using over-size chess pieces that are easy to see and fun to move. These can vary in size from less than a foot tall to more than two feet tall. Just choose the size that fits your preference. Even young people enjoy the novelty of playing garden chess, so add it to your outdoor repertoire in time for your next get together.
at a chess factory
The House of Staunton manufactures the finest chess sets and chess boards. They offer a range of chess sets from luxury wood to standard wood chess boards. They are the largest chess set manufacturer in the world.
Amazon.com has a wide variety of magnetic chess sets ~ see related link below .
Chess sets can be a simple as a chess board made of cardboard with plastic playing pieces and those are rather inexpensive. In addition, chess sets can also be as expensive as you would like, it all depends on the material you would like it made of.
Yes, the PebbleZ company offers stone chess sets. You can pick from the many stone chess sets they have in their catalog. http://pebblez.com/stone-chess-sets.html
Marble, onyx, and alabaster are common types of rock used to make chess sets due to their durability and aesthetic appeal. Each type of rock offers unique patterns and colors that can create visually stunning chess sets.
The giant garden chess set has dimensions of 12x12 feet and is made of durable plastic material.
I like the way she sets the table. I have three chess sets. That boat sets high on the water.
About 200 dollars acconrding to checkmate chess sets