Grey Wolf Wolves Absorbent Stone Auto Coaster Car Nu Spilled Drinks In Your Car Driving You Mad ? Put an end to messy cupholders in your car or boat with this great idea. Made of absorbent stone, these high quality coasters will catch spills and drips. To remove, just press on one side and it pops right out. 2.6" round, designed to fit just about every standard cup holder.