Do more than protect surfaces when you use this coaster set to their full advertising potential! This set of 4 square-shaped, absorbent coasters is made of stone and feature a cork backing. Customize each coaster with a corporate logo, name or advertising message to create a gift that is ideal for promoting your business. Each coaster measures 4 1/4" x 4 1/4" x 5/16". Distribute this useful giveaway during tradeshows, conventions, celebratory events and more. The options are endless with these amazing accessories!