Zentangle Coasters - Fun Drinking Coasters - Set of Artistic Coasters hand drawn by ZenJoanie - "Which Way"
All art is hand drawn by ZenJoanie Product Information Product dimensions: 3.5"W x 3.5"D x 0.3"H. Each coaster weighs .08 ounces. They're made of neoprene. According to Wikipedia: "Neoprene... is a family of synthetic rubbers that... maintains flexibility over a wide temperature range. Neoprene is sold either as solid rubber or in latex form, and is used in a wide variety of applications, such as laptop sleeves, orthopedic braces (wrist, knee, etc.)...." Each coaster can tolerate up to 200° Fahrenheit (93.33° Celsius) and is water resistant. They are printed with Art on the front and the back is black.