These wood coasters come in a set of 4 and are approximately 3.5" and .25 thick. Sizes slightly and shapes vary due to the shape of the natural wood.  The edges are trimmed with natural bark.  The coaster is infused with a print of one of my original paintings and sealed with polyurethane.  The coasters have cork on the bottom. (Hand wipe due to the bark and cork)  
If you have any questions, please contact me.