Product dimensions: 3.5"W x 3.5"D x 0.3"H. They're made of neoprene. 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. The back is black
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