3dRose LLC cst_128179_2 Soft Coasters, "I Ate Sum Pi it Was Delicious/Math Humor/Mathematics/Math Teacher", Set of 8 Dimensions (in Inch): 3.5 H x 3.5 W x 1/4 D Comes in a set of 8 - same image on all coasters Washable - to prevent image from fading clean with mild detergent using cool water Absorbs moisture Made of recycled rubber