- Our solid wood magnets or drink coaster are the perfect gift or accent piece! Our clever sayings will be the center of conversations and add lots of humor to your space. They are thick, have a strong magnet on the back side, and have a waterproof coating on its surface. They can be used as a magnet or can be used as a coaster and after using it can be put back on the fridge for future use! * 4" X 4" *3/16" Thick *Waterproof Coating