Sugar Skull Slate Coaster custom laser engraving design by Frank C Pusateri letmebefrankDESIGN. 100% natural, slate stone coaster. This is natural slate stone and each piece will have it's own varying characteristics - which is the beauty of this natural rock. Easily wipe clean if needed. Foam pads on the bottom protect furniture. Makes a great unique gift or can be used as a display for your kitchen, bathroom, bedroom, living room, office.