3dRose cst_149838_2 Keep Calm and Pretend It's on The Lesson Plan. Teacher Humor. Professor Humor-Soft Coasters, Set of 8 Dimensions (in inches): 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