Fish Flounder Set of 2 Cup Holder Car Coasters Colorful Absorbant Sandstone Car Coasters. Set of 2 with this design. Both coasters measure 2 1/2 inches in diameter and are a little over 1/4 inch high. Make a statement in your vehicle about your personality and keep the water from making a big mess when your drink starts to melt. Make sure to take your drink with you when you leave your vehicle and leave your coaster! This Car Coasters is from Carolines Treasures Fish category of products.