"Beach Time" - Stone Car Coaster Cupholder. Round Car Coaster. This is an absorbent stone coaster that says, "Livin' on ... Beach Time." It measures about 2.625" in diameter x .3125" thick and fits most car cup holders. Having a small coaster like this is a great way to protect your car by catching the drips before they run off of your drink and onto your car upholstery!