Each coaster is ~3.95" with a thickness of ~.35". They each a have three rubber pads on the bottom to prevent sliding. Sold in sets of 4 ONLY 
 
Please note that due to the nature of wood and stone, each coaster's appearance will vary (coloring, texture, etc.). No two coasters are exactly alike.
 
GF setting used in the photos: 1000/60/170 and 535/30/270