IronClad® Sandstone Auto Car Cup Holder Coaster, Round with Divot, 2.56" x 0.30", White. Car coasters are perfect for adding photographic images or graphics. Decorating the automobile is a trend that will never go away, these can be marketed to souvenir shops, auto supply stores or convenience stores. All sand stone coasters are sold in increments of -8-. Single sample tiles are available through your Conde Account Manager.