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.
Product dimensions: 3.5'W x 3.5'D x 0.3'H.

Technical Details

Product Details

Product Dimensions

Item Weight: 0 ounce (View shipping rates and policies)

ASIN : B078RXVM7T