These Gear coasters are made in Vermont by my dad and made out of a recycled gears. The gear holes are filled with thick cork and the bottom is lined with cork so not to scratch the table! These gear coasters are 1/2 inch thick and 5 inches round. They have some weight to them. I am not sure what these gears came off of but they are quite interesting. This makes a great gift for any dad with a man cave, office, or garage. Great for Beer Drinkers, Gear Heads, Bikers, Car Enthusiasts, and the like. Has that Industrial look but great for the rednecks too!