4x4" Sold as a pair 
Superior Material: Sublimation Coasters Blanks Ceramic Tiles are made from absorbent material, has certain water absorption capacity, which can absorb all water stains from the bottom of the cup to the coaster, and keep the desktop clean, dry and tidy.

 
For Thermal Transfer: Use with sublimation ink, sublimation paper and hot press, Glazed Ceramic Tile is ideal for heat transfer printing. Kindly noted heated about 400 ℉ (200 ℃ ) for 200 seconds. (NOTE: If Sublimating Upright, please ensure that there is a silicone/ butcher  sheet on top)